<ahref="http://backuppc.sourceforge.net/">Backuppc</a> - Client-server model backup tool with file pooling scheme.</li>
<li>
<ahref="http://burp.grke.org/">Burp</a> - Network backup and restore program.</li>
<li>
<ahref="http://duplicity.nongnu.org/">Duplicity</a> - Encrypted bandwidth-efficient backup using the rsync algorithm.</li>
<li>
<ahref="https://github.com/axkibe/lsyncd">Lsyncd</a> - Watches a local directory trees for changes, and then spawns a process to synchronize the changes. Uses rsync by default.</li>
<ahref="http://archipelproject.org/">Archipel</a> - Manage and supervise virtual machines using Libvirt.</li>
<li>
<ahref="http://cloudstack.apache.org/">CloudStack</a> - Cloud computing software for creating, managing, and deploying infrastructure cloud services.</li>
<li>
<ahref="https://www.eucalyptus.com/">Eucalyptus</a> - Open source private cloud software with AWS compatibility.</li>
<li>
<ahref="http://opennebula.org/">OpenNebula</a> - An user-driven cloud management platform for sysadmins and devops.</li>
<li>
<ahref="https://www.openstack.org/">OpenStack</a> - Open source software for building private and public clouds.</li>
<li>
<ahref="http://theforeman.org/">The Foreman</a> - Foreman is a complete lifecycle management tool for physical and virtual servers. FOSS.</li>
<li>
<ahref="http://www.cobblerd.org/">Cobbler</a> - Cobbler is a Linux installation server that allows for rapid setup of network installation environments. </li>
<li>
<ahref="http://mesos.apache.org/">Mesos</a> - Develop and run resource-efficient distributed systems.</li>
<ahref="http://www.getcloudify.org/">Cloudify</a> - Open source TOSCA-based cloud orchestration software platform written in Python and YAML.</li>
<li>
<ahref="https://juju.ubuntu.com/">Juju</a> - Cloud orechestration tool which manages services as charms, YAML configuration and deployment script bundles.</li>
<li>
<ahref="http://puppetlabs.com/mcollective">MCollective</a> - Ruby framework to manage server orchestration, developed by Puppet labs.</li>
<li>
<ahref="http://andrewchilds.github.io/overcast/">Overcast</a> - Deploy VMs across different cloud providers, and run commands and scripts across any or all of them in parallel via SSH.</li>
<ahref="http://git-annex.branchable.com/assistant/">git-annex assistant</a> - A synchronised folder on each of your OSX and Linux computers, Android devices, removable drives, NAS appliances, and cloud services.</li>
<li>
<ahref="https://owncloud.org">ownCloud</a> - Provides universal access to your files via the web, your computer or your mobile devices.</li>
<li>
<ahref="http://seafile.com">Seafile</a> - Another Open Source Cloud Storage solution.</li>
<li>
<ahref="http://sparkleshare.org/">SparkleShare</a> - Provides cloud storage and file synchronization services. By default, it uses Git as a storage backend.</li>
<li>
<ahref="http://docs.openstack.org/developer/swift/">Swift</a> - A highly available, distributed, eventually consistent object/blob store.</li>
<li>
<ahref="http://syncthing.net/">Syncthing</a> - Open Source system for private, encrypted and authenticated distrobution of data.</li>
<p><em>Collaborative software or groupware suites.</em></p>
<ul>
<li>
<ahref="http://www.citadel.org/">Citadel/UX</a> - Collaboration suite (messaging and groupware) that is descended from the Citadel family of programs.</li>
<li>
<ahref="http://www.egroupware.org/">EGroupware</a> - Groupware software written in PHP.</li>
<li>
<ahref="https://www.kolab.org">Kolab</a> - Another groupware suite.</li>
<li>
<ahref="https://www.sogo.nu/">SOGo</a> - Collaborative software server with a focus on simplicity and scalability.</li>
<li>
<ahref="https://www.zimbra.com/community/">Zimbra</a> - Collaborative software suite, that includes an email server and web client.</li>
<ahref="http://www.i-doit.org/">i-doit</a> - Open Source IT Documentation and CMDB.</li>
<li>
<ahref="http://www.combodo.com/-Overview-.html">iTop</a> - A complete open source, ITIL, web based service management tool.</li>
<li>
<ahref="https://github.com/allegro/ralph">Ralph</a> - Asset management, DCIM and CMDB system for large Data Centers as well as smaller LAN networks.</li>
<li>
<ahref="https://github.com/clusto/clusto">Clusto</a> - Helps you keep track of your inventory, where it is, how it's connected, and provides an abstracted interface for interacting with the elements of the infrastructure.</li>
<ahref="http://www.ansibleworks.com/">Ansible</a> - It's written in Python and manages the nodes over SSH.</li>
<li>
<ahref="http://cfengine.com/">CFEngine</a> - Lightweight agent system. Configuration state is specified via a declarative language.</li>
<li>
<ahref="http://www.opscode.com/chef/">Chef</a> - It's written in Ruby and Erlang and uses a pure-Ruby DSL.</li>
<li>
<ahref="http://www.fabfile.org/">Fabric</a> - Python library and cli tool for streamlining the use of SSH for application deployment or systems administration tasks.</li>
<li>
<ahref="http://palletops.com/">Pallet</a> - Infrastructure definition, configuration and management via a Clojure DSL.</li>
<li>
<ahref="http://puppetlabs.com/">Puppet</a> - It's written in Ruby and uses Puppet's declarative language or a Ruby DSL.</li>
<li>
<ahref="http://www.saltstack.com/">Salt</a> - It's written in Python.</li>
<li>
<ahref="http://steve.org.uk/Software/slaughter/">Slaughter</a> - It's written in Perl.</li>
</ul><h2>
<aname="continuous-integration--continuous-deployment"class="anchor"href="#continuous-integration--continuous-deployment"><spanclass="octicon octicon-link"></span></a>Continuous Integration & Continuous Deployment</h2>
<ahref="http://www.openafs.org/">OpenAFS</a> - Distributed network file system with read-only replicas and multi-OS support.</li>
<li>
<ahref="https://tahoe-lafs.org/trac/tahoe-lafs">TahoeLAFS</a> - secure, decentralized, fault-tolerant, peer-to-peer distributed data store and distributed file system.</li>
<li>
<ahref="http://www.xtreemfs.org/">XtreemFS</a> - XtreemFS is a fault-tolerant distributed file system for all storage needs.</li>
<ahref="https://www.isc.org/downloads/bind/">Bind</a> - The most widely used name server software.</li>
<li>
<ahref="http://cr.yp.to/djbdns.html">djbdns</a> - A collection of DNS applications, including tinydns.</li>
<li>
<ahref="https://wiki.openstack.org/wiki/Designate">Designate</a> - DNS REST API that support several DNS servers as its backend.</li>
<li>
<ahref="http://www.thekelleys.org.uk/dnsmasq/doc.html">dnsmasq</a> - A lightweight service providing DNS, DHCP and TFTP services to small-scale networks.</li>
<li>
<ahref="https://www.knot-dns.cz/">Knot</a> - High performance authoritative-only DNS server.</li>
<li>
<ahref="http://www.nlnetlabs.nl/projects/nsd/">NSD</a> - Authoritative only, high performance, simple name server.</li>
<li>
<ahref="https://www.powerdns.com/">PowerDNS</a> - DNS server with a variety of data storage back-ends and load balancing features.</li>
<li>
<ahref="http://unbound.net/">Unbound</a> - Validating, recursive, and caching DNS resolver.</li>
<li>
<ahref="http://yadifa.eu/">Yadifa</a> - Lightweight authoritative Name Server with DNSSEC capabilities powering the .eu top-level domain.</li>
</ul><h2>
<aname="hosting-control-panels"class="anchor"href="#hosting-control-panels"><spanclass="octicon octicon-link"></span></a>Hosting Control Panels</h2>
<p><em>Web hosting control panels</em></p>
<ul>
<li>
<ahref="http://ajenti.org/">Ajenti</a> - Control panel for Linux and BSD.</li>
<li>
<ahref="http://feathur.com">Feathur</a> - VPS Provisioning and Management Software.</li>
<li>
<ahref="http://www.ispconfig.org">ISPConfig</a> - Hosting control panel for Linux.</li>
<li>
<ahref="http://www.vestacp.com/">VestaCP</a> - Hosting panel for Linux but with Nginx.</li>
<li>
<ahref="http://www.virtualmin.com/">Virtualmin</a> - Control panel for Linux based on webmin.</li>
<li>
<ahref="http://www.zpanelcp.com/">ZPanel</a> - Control panel for Linux, BSD, and Windows.</li>
<ahref="http://www.glpi-project.org/spip.php?lang=en">GLPI</a> - Information Resource-Manager with an additional Administration Interface.</li>
<li>
<ahref="http://www.ocsinventory-ng.org/en/">OCS Inventory NG</a> - Enables users to inventory their IT assets.</li>
<li>
<ahref="http://racktables.org/">RackTables</a> - Datacenter and server room asset management like document hardware assets, network addresses, space in racks, networks configuration.</li>
<li>
<ahref="https://github.com/allegro/ralph">Ralph</a> - Asset management, DCIM and CMDB system for large Data Centers as well as smaller LAN networks.</li>
<li>
<ahref="http://snipeitapp.com/">Snipe IT</a> - Asset & license management software.</li>
<ahref="http://port389.org">389 Directory Server</a> - Developed by Red Hat.</li>
<li>
<ahref="http://directory.apache.org/">Apache Directory Server</a> - Apache Software Foundation project written in Java.</li>
<li>
<ahref="http://www.fusiondirectory.org">Fusion Directory</a> - Improve the Management of the services and the company directory based on OpenLDAP.</li>
<li>
<ahref="http://opendj.forgerock.org/">OpenDJ</a> - Fork of OpenDS.</li>
<li>
<ahref="https://opends.java.net/">OpenDS</a> - Another directory server written in Java.</li>
<li>
<ahref="http://openldap.org/">OpenLDAP</a> - Developed by the OpenLDAP Project.</li>
<ahref="http://www.naemon.org/">Naemon</a> - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features.</li>
<li>
<ahref="http://www.nagios.org/">Nagios</a> - Computer system, network and infrastructure monitoring software application.</li>
<li>
<ahref="http://www.observium.org/">Observium</a> - SNMP monitoring for servers and networking devices. Runs on linux.</li>
<li>
<ahref="http://omdistro.org/">OMD</a> - The Open Monitoring Distribution.</li>
<li>
<ahref="http://www.opsview.com/solutions/core">Opsview</a> - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.</li>
<li>
<ahref="http://riemann.io/">Riemann</a> - Flexible and fast events processor allowing complex events/metrics analysis.</li>
<li>
<ahref="http://sensuapp.org/">Sensu</a> - Open source monitoring framework.</li>
<li>
<ahref="https://getsentry.com/">Sentry</a> - Application monitoring, event logging and aggregation.</li>
<li>
<ahref="http://www.shinken-monitoring.org/">Shinken</a> - Another monitoring framework.</li>
<li>
<ahref="http://www.thruk.org/">Thruk</a> - Multibackend monitoring webinterface with support for Naemon, Nagios, Icinga and Shinken.</li>
<li>
<ahref="http://www.xymon.com/">Xymon</a> - Network monitoring inspired by Big Brother.</li>
<li>
<ahref="http://www.zabbix.com/">Zabbix</a> - Enterprise-class software for monitoring of networks and applications.</li>
<li>
<ahref="http://community.zenoss.org">Zenoss</a> - Application, server, and network management platform based on Zope.</li>
</ul><h2>
<aname="metric--metric-collection"class="anchor"href="#metric--metric-collection"><spanclass="octicon octicon-link"></span></a>Metric & Metric Collection</h2>
<p><em>Metric gathering and display software.</em></p>
<ul>
<li>
<ahref="http://collectd.org/">Collectd</a> - System statistic collection daemon.</li>
<li>
<ahref="http://collectl.sourceforge.net/">Collectl</a> - High precision system performance metrics collecting tool.</li>
<li>
<ahref="http://dashing.io/">Dashing</a> - Ruby gem that allows for rapid statistical dashboard development. An all HTML5 approach allows for big screen displays in data centers or conference rooms.</li>
<li>
<ahref="https://github.com/BrightcoveOS/Diamond">Diamond</a> - Python based statistic collection daemon.</li>
<li>
<ahref="http://grafana.org/">Grafana</a> - A Graphite & InfluxDB Dashboard and Graph Editor.</li>
<li>
<ahref="http://ganglia.sourceforge.net/">Ganglia</a> - High performance, scalable RRD based monitoring for grids and/or clusters of servers. Compatible with Graphite using a single collection process.</li>
<li>
<ahref="http://graphite.readthedocs.org/en/latest/">Graphite</a> - Open source scaleable graphing server.</li>
<li>
<ahref="http://influxdb.com/">InfluxDB</a> - Open source distributed time series database with no external dependencies.</li>
<li>
<ahref="http://opentsdb.net/">OpenTSDB</a> - Store and server massive amounts of time series data without losing granularity.</li>
<li>
<ahref="http://oss.oetiker.ch/rrdtool/">RRDtool</a> - Open source industry standard, high performance data logging and graphing system for time series data.</li>
<ahref="http://www.neo4j.org/">Neo4j</a> - Open source graph database.</li>
</ul>
</li>
<li>Key-Value
<ul>
<li>
<ahref="https://code.google.com/p/leveldb/">LevelDB</a> - Google's high performance key/value database.</li>
<li>
<ahref="http://redis.io/">Redis</a> - Networked, in-memory, key-value data store with optional durability.</li>
<li>
<ahref="http://basho.com/riak/">Riak</a> - Another fault-tolerant key-value NoSQL database.</li>
</ul>
</li>
</ul><p>Comparison of NoSQL servers: <ahref="http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis">http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis</a></p>
<ahref="http://www.firebirdsql.org/">Firebird</a> - True universal open source database.</li>
<li>
<ahref="http://galeracluster.com/">Galera</a> - Galera Cluster for MySQL is an easy-to-use high-availability solution with high system up-time, no data loss, and scalability for future growth.</li>
<li>
<ahref="https://mariadb.org/">MariaDB</a> - Community-developed fork of the MySQL.</li>
<li>
<ahref="http://dev.mysql.com/">MySQL</a> - Most popular RDBMS server.</li>
<li>
<ahref="http://www.percona.com/software">Percona Server</a> - Enhanced, drop-in MySQL replacement.</li>
<li>
<ahref="http://www.postgresql.org/">PostgreSQL</a> - Object-relational database management system (ORDBMS).</li>
<li>
<ahref="http://www.postgres-xl.org/">PostgreSQL-XL</a> - Scalable Open Source PostgreSQL-based database cluster.</li>
<li>
<ahref="http://sqlite.org/">SQLite</a> - Library that implements a self-contained, serverless, zero-configuration, transactional SQL DBS.</li>
<ahref="http://www.exim.org/">Exim</a> - Message transfer agent (MTA) developed at the University of Cambridge.</li>
<li>
<ahref="http://haraka.github.io/">Haraka</a> - A high-performance, pluginable SMTP server written in JavaScript.</li>
<li>
<ahref="http://mailcatcher.me/">MailCatcher</a> - Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.</li>
<li>
<ahref="https://github.com/m242/maildrop">Maildrop</a> - Open Source disposable email SMTP server, also useful for development.</li>
<li>
<ahref="https://opensmtpd.org/">OpenSMTPD</a> - Secure SMTP server implementation from the OpenBSD project.</li>
<li>
<ahref="http://www.postfix.org/">Postfix</a> - Fast, easy to administer, and secure Sendmail replacement.</li>
<ahref="http://www.harding.motd.ca/autossh/">autossh</a> - Automatically respawn ssh session after network interruption.</li>
<li>
<ahref="http://sourceforge.net/projects/clusterssh/">Cluster SSH</a> - Controls a number of xterm windows via a single graphical console.</li>
<li>
<ahref="http://www.netfort.gr.jp/%7Edancer/software/dsh.html.en">DSH</a> - Dancer's shell / distributed shell - Wrapper for executing multiple remote shell commands from one command line.</li>
<li>
<ahref="http://mosh.mit.edu/">Mosh</a> - The mobile shell.</li>
<li>
<ahref="http://code.google.com/p/parallel-ssh/">parallel-ssh</a> - Provides parallel versions of OpenSSH and related tools.</li>
<li>
<ahref="http://code.google.com/p/sshpt/">SSH Power Tool</a> - Execute commands and upload files to many servers simultaneously without using pre-shared keys.</li>
<ahref="http://www.bugzilla.org/">Bugzilla</a> - General-purpose bugtracker and testing tool originally developed and used by the Mozilla project.</li>
<li>
<ahref="http://www.cerberusweb.com/">Cerb</a> - A group-based e-mail management project built with a commercial open source license.</li>
<li>
<ahref="http://flyspray.org">Flyspray</a> - Web-based bug tracking system written in PHP.</li>
<li>
<ahref="http://www.mantisbt.org/">MantisBT</a> - Another web-based bug tracking system.</li>
<li>
<ahref="http://osticket.com/">osTicket</a> - Open source support ticket system.</li>
<li>
<ahref="http://www.otrs.com/">Otrs</a> - A free and open-source trouble ticket system software package that a company, organization, or other entity can use to assign tickets to incoming queries and track further communications about them.</li>
<li>
<ahref="http://www.bestpractical.com/rt/">Request Tracker</a> - Ticket-tracking system written in Perl.</li>
<li>
<ahref="http://www.thebuggenie.com">TheBugGenie</a> - Open source ticket system with extremely complete users rights granularity.</li>
<ahref="http://mitmproxy.org/">mitmproxy</a> - A Python tool used for intercepting, viewing and modifying network traffic. Invaluable in troubleshooting certain problems.</li>
<li>
<ahref="http://www.sysdig.org/">Sysdig</a> - Capture system state and activity from a running Linux instance, then save, filter and analyze.</li>
<ahref="https://code.google.com/p/ganeti/">Ganeti</a> - Cluster virtual server management software tool built on top of KVM and Xen.</li>
<li>
<ahref="http://www.linux-kvm.org">KVM</a> - Linux kernel virtualization infrastructure.</li>
<li>
<ahref="http://www.ovirt.org/">oVirt</a> - Manages virtual machines, storage and virtual networks.</li>
<li>
<ahref="http://www.packer.io/">Packer</a> - A tool for creating identical machine images for multiple platforms from a single source configuration.</li>
<li>
<ahref="https://www.vagrantup.com/">Vagrant</a> - Tool for building complete development environments.</li>
<li>
<ahref="https://www.virtualbox.org/">VirtualBox</a> - Virtualization product from Oracle Corporation.</li>
<li>
<ahref="http://www.xenproject.org/">Xen</a> - Virtual machine monitor for 32/64 bit Intel / AMD (IA 64) and PowerPC 970 architectures.</li>
<ahref="http://httpd.apache.org/">Apache</a> - Most popular web server.</li>
<li>
<ahref="http://cherokee-project.com/">Cherokee</a> - Lightweight, high-performance web server/reverse proxy.</li>
<li>
<ahref="http://www.lighttpd.net/">Lighttpd</a> - Web server more optimized for speed-critical environments.</li>
<li>
<ahref="http://nginx.org/">Nginx</a> - Reverse proxy, load balancer, HTTP cache, and web server.</li>
<li>
<ahref="https://github.com/unbit/uwsgi/">uWSGI</a> - The uWSGI project aims at developing a full stack for building hosting services.</li>
</ul><p><em>Web Performance</em></p>
<ul>
<li>
<ahref="http://www.haproxy.org/">HAProxy</a> - Software based load Balancing, SSL offloading and performance optimization, compression, and general web routing.</li>
<li>
<ahref="https://www.varnish-cache.org/">Varnish</a> - HTTP based web application accelerator focusing on optimizing caching and compression.</li>
<ahref="http://linuxcommand.org/tlcl.php">The Linux Command Line</a> - A book about the Linux command line by William Shotts.</li>
<li>
<ahref="http://itrevolution.com/books/phoenix-project-devops-book/">The Phoenix Project: A Novel about IT, DevOps, and Helping Your Business Win</a> - How DevOps techniques can fix the problems that happen in IT organizations.</li>
<li>
<ahref="http://everythingsysadmin.com/books.html">The Practice of System and Network Administration</a> - The first and second editions describes the best practices of system and network administration, independent of specific platforms or technologies.</li>
<li>
<ahref="http://www.itpi.org/the-visible-ops-handbook-review.html">The Visible Ops Handbook: Implementing ITIL in 4 Practical and Auditable Steps</a> - Is a methodology designed to jumpstart implementation of controls and process improvement.</li>
<li>
<ahref="http://www.admin.com/">UNIX and Linux System Administration Handbook</a> - Approaches system administration from a practical perspective.</li>
<ahref="http://www.opsschool.org">Ops School</a> - Comprehensive program that will help you learn to be an operations engineer.</li>
<li>
<ahref="https://www.digitalocean.com/community/tutorials">Digital Ocean Tutorials</a> - A surprisingly vast resource for getting the basics of certain applications, tools, or even systems administration topics. (Note: Digital Ocean pays authors for this content)</li>
