Open Source

Open-Source Foundation: http://www.opensource.org
OS GPL 3.0 Licence: http://www.fsf.org/news/gpl3.html

Open Source Licenses

GNU Licenses: http://www.gnu.org/licenses/licenses.html
Open Source Aproved Licenses: http://www.opensource.org/licenses/index.php

Most Popular OS Projects/Applications

CMS Ratings - OpenSourceCMS: http://www.opensourcecms.com/index.php?option=content&task=view&id=388&Itemid=143
OS LAMP: http://www.onlamp.com
OSDir.com: http://osdir.com/Downloads+MostPopular.phtml

Apache Foundation

Apache Official Projects: http://www.apache.org/foundation/projects.html
Apache Incubator Projects: http://incubator.apache.org/projects/index.html


CVS 

GNU CVS: http://www.nongnu.org/cvs
CVS Page: https://www.cvshome.org
SourceForge Docs: CVS http://sourceforge.net/docman/display_doc.php?docid=29894&group_id=1
SourceForge Command-line CVS client with OpenSSH: http://sourceforge.net/docman/display_doc.php?group_id=1&docid=14035

CVS Books, Tutorials & Manuals

Official Manual "CVSVersion Management with CVS" by Per Cederqvist et al: http://ximbiot.com/cvs/manual
CVS eBook "Open Source Development with CVS" by K. Fogel & M. Bar: http://cvsbook.red-bean.com
Essential CVS by J. Vesperman: http://www.oreilly.com/catalog/cvs
Control de versiones con Subversion by B. Collins-Sussman et al: http://svnbook.red-bean.com
Tutorial "A Day With CVS" section of Open Source Development with CVS: http://cvsbook.red-bean.com/cvsbook.html#A%20Day%20With%20CVS
CVS Intro: http://www.linuxdevcenter.com/pub/a/linux/2002/01/03/cvs_intro.html
CVS Tutorial: http://www.csc.calpoly.edu/~dbutler/tutorials/winter96/cvs

CVS Clients & GUIs & SSH Clients

CVSNT for Windows: http://www.march-hare.com/cvsnt
WinCVS for Windows: http://www.wincvs.org/download.html
TortoiseCVS: http://www.tortoisecvs.org/download.shtml
SSH PuTTY: http://www.chiark.greenend.org.uk/~sgtatham/putty

Other Open Source Versioning Systems, Tools & Software

Subversion: http://subversion.tigris.org
Meta-CVS: http://users.footprints.net/~kaz/mcvs.html
GNU Arch: http://gnuarch.org
OpenCM: http://www.opencm.org
Aegis: http://aegis.sourceforge.net
Monotone: http://www.venge.net/monotone
Version Control Systems Comparison: http://better-scm.berlios.de/comparison
The New Breed of Version Control Systems: http://www.onlamp.com/pub/a/onlamp/2004/01/29/scm_overview.html
dmoz Configuration Managment Tools: http://dmoz.org/Computers/Software/Configuration_Management/Tools
Versioning Systems (OSDir.com): http://osdir.com/Downloads+index-req-viewsdownload-sid-164.phtml
Version Control Systems in Linux: http://linuxmafia.com/faq/Apps/scm.html
Software Dev: Environment (OSDir.com): http://osdir.com/Downloads+index-req-viewsdownload-sid-135.phtml
Recursos de Unix, Linux y software con licencia GNU: http://webmasters.astalaweb.com/WWW/Linux.asp
Software Esencial en Internet: http://www.zonageek.com/articulos/geek/software_esencial

Open Source News & Magazines:

http://it.slashdot.org
http://developers.slashdot.org
http://opensource.oreilly.com
http://open.itworld.com
Conferencias: http://www.opensourceworldconference.com

Open Source Articles

http://www.developer.com/open
http://dmoz.org/Computers/Open_Source/Articles
http://www.libervis.com
http://www.dhtml-zone.com/DevX/RSSFeed/20615
Comparación entre plataformas de Páginas Web Dinámicas: LAMP vs. WISA: http://www.shawnolson.net/a/302
BLOG 2005 OS Trends: http://billburnham.blogs.com/burnhamsbeat/open_source

Google, Yahoo, Web Crawlers, etc.

Google Search "content management" "open source": http://www.google.com/search?hl=en&lr=&q=%22content+management%22+%22open+source%22&btnG=Search

Wikipedia: Open-Source Terms & Popular Projects
http://es.wikipedia.org/wiki/Linux
http://es.wikipedia.org/wiki/MySQL
http://es.wikipedia.org/wiki/Perl
http://es.wikipedia.org/wiki/GIMP
http://es.wikipedia.org/wiki/PHP
http://es.wikipedia.org/wiki/Wiki