Notes:

• In general, these will be listed in order of preference
• Open-source unless otherwise noted

Blog

• WordPress
  • Blogging software that can also act as a full-blown CMS
• Ghost
  • Simple and lightweight blog server (doesn’t include search by default, for example)

Chat/instant messaging server

• Openfire
  • Uses XMPP (Jabber) protocol
• ejabberd
  • Uses XMPP (Jabber) protocol

CMS (content management system)

• WordPress
  • The most popular CMS
  • Also a blogging platform
• Kotti
  • Written in Python
  • Based on Pyramid framework

Code hosting/repository management/issue tracking

• Gogs
  • Very fast and lightweight
  • Less features than GitLab but fully free and open-source
• GitLab
  • Community and enterprise editions

Configuration management

• SaltStack
  • Written in Python
  • Improvements over Puppet:
    • Maintains constant client connections so changes are immediate
    • More integrated and easier to configure orchestration than Puppet’s MCollective
    • Handles SSL keys better than Puppet
    • The community version of SaltStack has the same features as the enterprise version
    • Uses YAML, which is arguably easier to write than Puppet DSL

Directory server

• OpenLDAP
  • Fastest implementation of LDAP
    • Compared to 389/Fedora DS
    • Compared to OpenDS and ApacheDS
    • Compared to Oracle Internet Directory and OpenDS
    • Compared to AD
  • Most scalable implementation of LDAP
    • http://connexitor.com/blog/pivot/entry.php?id=203
• OpenDJ/OpenDS
  • OpenDJ: fork of OpenDS after Oracle acquired Sun and stopped development of OpenDS
  • Written in Java, slightly slower than OpenLDAP (http://www.symas.com/index.php/blog/more-benchmarking/)
  • Easier to set up than OpenLDAP
• 389 Directory Server (formerly Fedora Directory Server)
  • Slower than OpenLDAP (http://www.connexitor.com/blog/pivot/entry.php?id=130)
  • Sold commercially as Red Hat Directory Server
• Apache Directory Server
  • Written in Java, much slower than OpenLDAP (http://www.connexitor.com/blog/pivot/entry.php?id=131)

Email/communication

• Zimbra Collaboration Server
  • Email, calendar, address book, document sharing, chat, VOIP, web interface

File storage/collaboration

• Zimbra Collaboration Server

• ownCloud
  • Versioning
  • Collaborative editing of .odt and .doc files
  • Full text file search
  • REST API
  • Community and Enterprise editions
• Seafile
  • Versioning
  • Markdown support
  • Community and Professional editions
    • Some features only available in the paid edition, like full text file search, HA

Question and answer (like stackexchange.com)

• Askbot
  • Written in Python, on Django web framework
  • Similar origins as OSQA
• OSQA
  • Written in Python, on Django web framework

System monitoring

• Shinken
  • Compatible with Nagios
  • Completely redesigned to be more powerful, efficient, flexible than Nagios
• Icinga
  • Compatible with Nagios
  • Rewrite of Nagios with updated web interface, more database connectors, and REST API

Wiki

• MediaWiki
  • The best free wiki software available
• Confluence
  • The best commercial wiki software available
  • Free for open-source, nonprofits, and classroom use