Visit the following sites for open source related information

Home Page - Open Source Movement India
Learn more about our group

Open Source Projects
Students can join this community and work on large projects under
the guidance of experienced programmers
http://www.ossprojects.net/index.php   

Open Source Forum in India
Maintained by National Informatics Centre
http://osf.nic.in/openSourceSite   

Apache
Lots of very successful projects
http://www.apache.org/   

Eclipse
Most popular open source Integrated Development environment
http://www.eclipse.org/  

JBoss
Most popular open source Application server
http://www.jboss.org/index.html   

Linux
Pioneer in the open source world. Most popular Operating System.
http://www.linux.org/   

MySQL Database
Most popular open source Database Engine
http://www.mysql.com/   

Source Forge
Great website which hosts tons of open source projects
http://sourceforge.net/

Content Management System
Excellent tool for content management
http://plone.org/