GNU/Linux Application Programming (Programming Series)

Open Source Initiative (OSI) at http://www.opensource.org/

Developer.com at http://www.developer.com/open/

Open Source Technology Group at http://www.ostg.com/

GNU Project License List at http://www.gnu.org/licenses/license-list.html

Freshmeat at http://www.freshmeat.net

SourceForge at http://www.sourceforge.net

Why Open Source Software/Free Software (OSS/FS)? Look at the Numbers! at http://www.dwheeler.com/oss_fs_why.html