I have hands on experience on so many opensource projects. I have done these projects as my hobby as well as a professional.

Mail Severs

* Postfix
* Sendmail
* Qmail

Proxy

* Squid

WebServers

* Apache
* Lighthttpd
* Tomcat

Telephony

* Asterisk
* Vicidial
* FreeSwitch

DNS

BIND

Webservices

* Amazon
* EC2(Elastic Computer Cloud)
* S3(Simple Storage solution)

Blog

* Roller
* WordPress

Bug-Tracking

* Buggzilla
* Mantis
* Trac

CMS

* Alfresco
* Drupal
* Joomla
* KnowledgeTree

CRM

* SugarCRM

ECM

* Alfresco
* KnowledgeTree

Forum

* phpBB

Portal Server

* Liferay

Version Control

* Subversion

Wiki

* DokuWiki
* MediaWiki
* DokuWiki

eLearning

* Dokeos
* Moodle

If anybody interested or having any problem in above mentioned projects please feel free to contact me at +91 9899184890 or mail me out at ramesh.mimit@gmail.com