Educational:

AICTE free Software

Personal Utility:

Ad Block Plus (Removes unwanted ads from webpage & increases surfing speed)

Sleeper (Screen is turned off saves power)

Ccleaner (Deletes all type of temporary files)

Mass Image Compressor

Free Software Directory

Software in Indian Languages (By Technology Developments for Indian Languages)

Operating System:

Bharat Operating System Solutions (By Center for Development of Advance Computing)