Added @snipe's Snipe IT project
Awesome Sysadmin
A curated list of amazingly awesome open source sysadmin resources inspired by Awesome PHP
- Awesome Sysadmin
- Backups
 - Cloning
 - Cloud Computing
 - Cloud Storage
 - Configuration Management Database
 - Configuration Management
 - Continuous Integration
 - Distributed Filesystems
 - DNS
 - Hosting Control Panels
 - IMAP/POP3
 - IT Asset Management
 - LDAP
 - Monitoring
 - Metric & Metric Collection
 - Log management
 - Network Configuration Management
 - Newsletter
 - NoSQL
 - RDBMS
 - SMTP
 - Software Containers
 - SSH
 - Statistics
 - Ticketing systems
 - Troubleshooting
 - Project Management
 - Version control
 - Virtualization
 - VPN
 - Web
 - Webmails
 - Wikis
 
 - Resources
 - Contributing
 
Backups
Backup software.
- Amanda - Client-server model backup tool.
 - Bacula - Another Client-server model backup tool.
 - Backuppc - Client-server model backup tool with file pooling scheme.
 - Burp - Network backup and restore program.
 - Rsnapshot - Filesystem Snapshotting Utility.
 - SafeKeep - Centralized pull-based backup using 
rdiff-backup. - TarSnap - Secure backup service with an open-source client.
 - UrBackup - Another client-server backup system.
 
Cloning
Cloning software.
- Clonezilla - Partition and disk imaging/cloning program.
 - Fog - Another computer cloning solution.
 - Redo Backup - Easy Backup, Recovery and Restore.
 
Cloud Computing
- CloudStack - Cloud computing software for creating, managing, and deploying infrastructure cloud services.
 - Eucalpytus - Open source private cloud software with AWS compatibility.
 - OpenNebula - An user-driven cloud management platform for sysadmins and devops.
 - OpenStack - Open source software for building private and public clouds.
 
Cloud Storage
- git-annex assistant - A synchronised folder on each of your OSX and Linux computers, Android devices, removable drives, NAS appliances, and cloud services.
 - ownCloud - Provides universal access to your files via the web, your computer or your mobile devices.
 - Seafile - Another Open Source Cloud Storage solution.
 - TahoeLAFS - Secure, decentralized, fault-tolerant, peer-to-peer distributed data store and distributed file system.
 
Configuration Management Database
Configuration management database (CMDB) software.
- i-doit - Open Source IT Documentation and CMDB.
 - iTop - A complete open source, ITIL, web based service management tool.
 
Configuration Management
Configuration management tools.
- Ansible - It's written in Python and manages the nodes over SSH.
 - CFEngine - Lightweight agent system. Configuration state is specified via a declarative language.
 - Chef - It's written in Ruby and Erlang and uses a pure-Ruby DSL.
 - Puppet - It's written in Ruby and uses Puppet's declarative language or a Ruby DSL.
 - Salt - It's written in Python.
 - Slaughter - It's written in Perl.
 
Continuous Integration
Continuous integration software.
- GitLab CI - Based off of ruby. They also provide GitLab, which manages git repositories.
 - Go - Open source agile build and release management software.
 - Jenkins - An extendable open source continuous integration server.
 
Distributed Filesystems
Network distributed filesystems.
- Ceph - Distributed object store and file system.
 - DRBD - Disributed Replicated Block Device.
 - GlusterFS - Scale-out network-attached storage file system.
 - HDFS - Distributed, scalable, and portable file-system written in Java for the Hadoop framework.
 - Lustre - A type of parallel distributed file system, generally used for large-scale cluster computing.
 - MooseFS - Fault tolerant, network distributed file system.
 - XtreemFS - XtreemFS is a fault-tolerant distributed file system for all storage needs.
 
DNS
DNS servers.
- Bind - The most widely used name server software.
 - djbdns - A collection of DNS applications, including tinydns.
 - Knot - High performance authoritative-only DNS server.
 - NSD - Authoritative only, high performance, simple name server.
 - PowerDNS - DNS server with a variety of data storage back-ends and load balancing features.
 - Unbound - Validating, recursive, and caching DNS resolver.
 - Yadifa - Lightweight authoritative Name Server with DNSSEC capabilities powering the .eu top-level domain.
 
Hosting Control Panels
Web hosting control panels
- Feathur - VPS Provisioning and Management Software.
 - ISPConfig - Hosting control panel for Linux.
 - VestaCP - Hosting panel for Linux but with Nginx.
 - Virtualmin - Control panel for Linux based on webmin.
 
IMAP/POP3
IMAP/POP3 mail servers.
- Courier IMAP/POP3 - Fast, scalable, enterprise IMAP and POP3 server.
 - Cyrus IMAP/POP3 - Intended to be run on sealed servers, where normal users are not permitted to log in.
 - Dovecot - IMAP and POP3 server written primarily with security in mind.
 - Qpopper - One of the oldest and most popular server implementations of POP3.
 
IT Asset Management
IT Assets Management software.
- GLPI - Information Resource-Manager with an additional Administration Interface.
 - OCS Inventory NG - Enables users to inventory their IT assets.
 - Snipe IT - Asset & license management software
 
LDAP
LDAP servers.
- 389 Directory Server - Developed by Red Hat.
 - Apache Directory Server - Apache Software Foundation project written in Java.
 - Fusion Directory - Improve the Management of the services and the company directory based on OpenLDAP.
 - OpenDJ - Fork of OpenDS.
 - OpenDS - Another directory server written in Java.
 - OpenLDAP - Developed by the OpenLDAP Project.
 
Monitoring
Monitoring software.
- Cacti - Web-based network monitoring and graphing tool.
 - check_mk - Collection of extensions for Nagios.
 - Icinga - Fork of Nagios.
 - LibreNMS - fork of Observium.
 - Monit - Small Open Source utility for managing and monitoring Unix systems.
 - Munin - Networked resource monitoring tool.
 - Naemon - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features.
 - Nagios - Computer system, network and infrastructure monitoring software application.
 - Observium - SNMP monitoring for servers and networking devices. Runs on linux.
 - Opsview - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.
 - Riemann - Flexible and fast events processor allowing complex events/metrics analysis.
 - Sensu - Open source monitoring framework.
 - Shinken - Another monitoring framework.
 - Thruk - Multibackend monitoring webinterface with support for Naemon, Nagios, Icinga and Shinken.
 - Xymon - Network monitoring inspired by Big Brother.
 - Zabbix - Eenterprise-class software for monitoring of networks and applications
 - Zenoss - Application, server, and network management platform based on Zope.
 
Metric & Metric Collection
Metric gathering and display software.
- Collectd - System statistic collection daemon.
 - Collectl - High precision system performance metrics collecting tool.
 - Diamond - Python based statistic collection daemon.
 - Graphite - Open source scaleable graphing server.
 - InfluxDB - Open source distributed time series database with no external dependencies.
 - RRDtool - Open source industry standard, high performance data logging and graphing system for time series data.
 - Statsd - Application statistic listener.
 - Grafana - A Graphite & InfluxDB Dashboard and Graph Editor.
 
Log management
Log management tools : collect, parse, visualize ...
- Logstash - Logstash is a tool for managing events and logs.
 - Kibana - Visualize logs and time-stamped data.
 
Network Configuration Management
Network configuration management tools.
- RANCID - Monitors network device's configurarion and maintain history of changes.
 - rConfig - Another network device configuration management tool.
 
Newsletters
Newsletter software.
- phpList - Newsletter manager.
 
NoSQL
NoSQL servers.
- Cassandra - Distributed DBMS designed to handle large amounts of data across many servers.
 - CouchDB - Ease of use, with multi-master replication document-oriented database system.
 - MongoDB - Another document-oriented database system.
 - Redis - Networked, in-memory, key-value data store with optional durability.
 - RethinkDB - Built to store JSON documents, and scale to multiple machines with very little effort. It supports really useful queries like table joins and group by.
 - Riak - Another fault-tolerant key-value NoSQL database.
 
Comparison of NoSQL servers: http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis
RDBMS
Relational DBMS.
- Firebird - True universal open source database.
 - MariaDB - Community-developed fork of the MySQL.
 - MySQL - Most popular RDBMS server.
 - Percona Server - Enhanced, drop-in MySQL replacement.
 - PostgreSQL - Object-relational database management system (ORDBMS).
 - SQLite - Library that implements a self-contained, serverless, zero-configuration, transactional SQL DBS.
 
SMTP
SMTP servers.
- Exim - Message transfer agent (MTA) developed at the University of Cambridge.
 - OpenSMTPD - Secure SMTP server implementation from the OpenBSD project.
 - Postfix - Fast, easy to administer, and secure Sendmail replacement.
 - Qmail - Secure Sendmail replacement.
 - Sendmail - Message transfer agent (MTA).
 
Software Containers
Operating system–level virtualization.
- Docker - Open platform for developers and sysadmins to build, ship, and run distributed applications.
 - OpenVZ - Container-based virtualization for Linux.
 
SSH
SSH tools.
- Cluster SSH - Controls a number of xterm windows via a single graphical console.
 - Mosh - The mobile shell.
 - parallel-ssh - Provides parallel versions of OpenSSH and related tools.
 - SSH Power Tool - Execute commands and upload files to many servers simultaneously without using pre-shared keys.
 
Statistics
Analytics software.
- Piwik - Free and open source web analytics application.
 
Ticketing systems
Web-based ticketing system.
- Bugzilla - General-purpose bugtracker and testing tool originally developed and used by the Mozilla project.
 - Cerb - A group-based e-mail management project built with a commercial open source license.
 - Flyspray - Web-based bug tracking system written in PHP.
 - MantisBT - Another web-based bug tracking system.
 - osTicket - Open source support ticket system.
 - Request Tracker - Ticket-tracking system written in Perl.
 - TheBugGenie - Open source ticket system with extremely complete users rights granularity.
 
Troubleshooting
Troubleshooting Tools.
- Sysdig - Capture system state and activity from a running Linux instance, then save, filter and analyze.
 
Project Management
Web-based project management and bug tracking systems.
- ChiliProject - Fork of Redmine.
 - GitLab - Clone of GitHub written in ruby.
 - Redmine - Written in ruby on rails.
 - The Bug Genie - Written in PHP.
 - Trac - Written in python.
 
Version control
Software versioning and revision control.
- Fossil - Distributed version control with built-in wiki and bug tracking.
 - Git - Distributed revision control and source code management (SCM) with an emphasis on speed.
 - Mercurial - Another distributed revision control.
 - Subversion - Client-server revision control system.
 
Virtualization
Virtualization software.
- Ganeti - Cluster virtual server management software tool built on top of KVM and Xen.
 - KVM - Linux kernel virtualization infrastructure.
 - oVirt - Manages virtual machines, storage and virtual networks.
 - VirtualBox - Virtualization product from Oracle Corporation.
 - Xen - Virtual machine monitor for 32/64 bit Intel / AMD (IA 64) and PowerPC 970 architectures.
 
VPN
VPN software.
- OpenVPN - Uses a custom security protocol that utilizes SSL/TLS for key exchange.
 - Pritunl - OpenVPN based solution. Easy to set up.
 - SoftEther - Multi-protocol software VPN with advanced features
 - sshuttle - Poor man's VPN.
 - strongSwan - Complete IPsec implementation for Linux.
 - tinc - Distributed p2p VPN.
 
Webmails
Webmail applications.
- RainLoop - Simple, modern & fast web-based IMAP client.
 - Roundcube - Browser-based IMAP client with an application-like user interface.
 
Web
Web servers.
- Apache - Most popular web server.
 - Cherokee - Lightweight, high-performance web server/reverse proxy.
 - Lighttpd - Web server more optimized for speed-critical environments.
 - Nginx - Reverse proxy, load balancer, HTTP cache, and web server.
 - uWSGI - The uWSGI project aims at developing a full stack for building hosting services.
 
Wikis
Wiki software.
- DokuWiki - Simple to use and highly versatile wiki that doesn't require a database.
 - ikiwiki - A wiki compiler.
 - Mediawiki - Used to power Wikipedia.
 - MoinMoin - An advanced, easy to use and extensible WikiEngine with a large community of users.
 - TiddlyWiki - Complete interactive wiki in JavaScript.
 
Resources
Various resources, such as books, websites and articles, for improving your skills and knowledge.
Books
Sysadmin related books.
- The Linux Command Line - A book about the Linux command line by William Shotts.
 - The Phoenix Project: A Novel about IT, DevOps, and Helping Your Business Win - How DevOps techniques can fix the problems that happen in IT organizations.
 - The Practice of System and Network Administration - The first and second editions describes the best practices of system and network administration, independent of specific platforms or technologies.
 - The Visible Ops Handbook: Implementing ITIL in 4 Practical and Auditable Steps - Is a methodology designed to jumpstart implementation of controls and process improvement.
 - UNIX and Linux System Administration Handbook - Approaches system administration from a practical perspective.
 
Editors
Open source code editors.
- Atom - A hackable text editor from Github.
 - Brackets - Open source code editor for web designers and front-end developers.
 - Eclipse - IDE written in Java with an extensible plug-in system.
 - Geany - GTK2 text editor.
 - Haroopad - Markdown editor with live preview.
 
Websites
Useful sysadmin related websites.
- Ops School - Comprehensive program that will help you learn to be an operations engineer.
 - Dotdeb - Repository with LAMP updated packages.
 
Contributing
Please see CONTRIBUTING for details.