IRS IT - National Academy of Direct Taxes, Nagpur
IRS- Customs - National Academy of Customs, Excise and Narcotics ( NACEN), Faridabad ( Their new academy is under construction in Bangalore, I think
IA&AS - National Academy of Audit & Accounts, Shimla
IPoS - Rafi Ahmed Kidwai National Postal Academy, Ghaziabad
IFS - Foreign Service Institute, Delhi
ICAS - Institute of Government Accounts & Finance, Delhi
IIS - Indian Institute of Mass Communication, Delhi
IRTS - Indian Railways Institute of Transportation Management, Lucknow
IRAS - National Academy of Indian Railways, Baroda
ICLS - Indian Institute of Corporate Affairs, Manesar
These are the ones I know of.