Central Excise and Service Tax, Govt of India website has inf about CRRS, Easiest and EDEC
CRRS - Web Based Application for Capturing the Revenue Summary of Central Excise, Customs and Service Tax Revenue
Easiest - TR-6 Challan Data electronically from Nominated Banks to NSDL
EDECS - Database oriented closed group communication system for Central Board of Excise and Customs
Web : http://sermon.nic.in/