Directories

BBC Open Source
Provides information about and links to BBC open source projects.
http://www.bbc.co.uk/opensource/

Enterprise Open Source List
A human edited directory of professional Open Source Software intended for the IT community.
http://eoslist.com/

Freshmeat
Unix and related software in all stages of development. Daily release announcements. Not restricted to open-source software.
http://freshmeat.net

GNU/UNESCO Free Software Directory
Lists free software packages organized and searchable by category.
http://directory.fsf.org/

Goodie Domain Service
Software, shareware and lots of useful hints to related information. Includes directory, search and associated links.
http://gd.tuwien.ac.at/

Google Code
Directory of in-development open source projects.
http://code.google.com/hosting/

IBM DeveloperWorks: Open Source
IBM's open source site includes articles, tutorials and a list of open source projects.
http://www.ibm.com/developerworks/opensource

Java Open Source Software
A directory of open source software focused on java.
http://java-source.net

My Open Source
A guide to Open Source software for the Windows platform. Lists most popular downloads and offers a review of each product.
http://www.myopensource.org/

NASA Open Source Software
Lists open source projects that could be essential to NASA missions. Help NASA with development of their projects - or simple enjoy them.
http://opensource.arc.nasa.gov/

Ohloh
Provides metrics and analysis on thousands of open source projects and contributors.
http://www.ohloh.net

Open Source Alternative
Helps you find open source alternatives to commercial software.
http://www.osalt.com/

Open Source IT
Offers a directory dedicated to enterprise grade open source solutions.
http://www.opensource-it.com

Open Source Scripts
Directory of scripts in various languages (Perl, PHP, JavaScript, ...).
http://www.opensourcescripts.com/

Open Source Software Directory
Provides a list of open source software organized by categories.
http://www.opensourcesoftwaredirectory.com

Open Source Software in C# (C-Sharp)
Directory of open source software focused in C#.
http://csharp-source.net/

Open Source Windows
List of free open source software to perform common functions on a Microsoft Windows platform.
http://opensourcewindows.org/

Open-Source Directory
Directory of open-source and just working programs.
http://www.osdir.com/

Opensourceinfo
A listing of distributions, applications and websites including their features. Includes forums, links and the latest news.
http://www.opensourceinfo.org/

OS Reviews
Website publishing reviews of free and open source software.
http://www.osreviews.net

ShareSource
Service offered for free to Open Source developers that provides easy access to SVN, bug tracking, message boards/forums, task management, site hosting, permanent file archival, full backups and daily repository snapshots.
http://sharesource.org/

SourceWell
A software announcement and retrieval system which gives updated news on open source software.
http://sourcewell.berlios.de

UNESCO Free Software Portal
A central directory of Open Source software, designed for a worldwide audience. Includes the latest industry news.
http://www.unesco.org/cgi-bin/webworld/portal_freesoftware/cgi/page.cgi?d=1

Webi.org
Provides a list of software for Windows organized by categories.
http://www.webi.org