Below is a small representation of various Public and Private Customers:

Aryabhatta Research Institute of Observational Sciences (ARIES)  Liquid Propulsion Systems Centre (LPSC) 
Central Electronics Engineering Research Institute (CEERI), Pilani  National Atmospheric Research Laboratory (NARL) 
Gujarat Electric Board (GEB) National Remote Sensing Centre (NRSC) 
Gujarat Energy Transmission Corporation Limited(GETCO) Nirma (Nirlife)
Honeywell, India  Oil and Natural Gas Corporation Ltd (ONGC)
Indian Institute of Space Science and Technology (IIST)  Physical Research Laboratory (PRL) 
Indian Institute of Technology (IIT) Raja Ramanna Centre for Advanced Technology (RRCAT) 
ISRO Inertial Systems Unit (IISU)  Satish Dhawan Space Centre (SHAR) 
ISRO Satellite Centre (ISAC), Bangalore  Space Application Centre (SAC) 
Kerala State Electronics Development Corporation Limited (Keltron)  University of Hyderabad
Laboratory for Electro-Optics Systems (LEOS), Bangalore  University of Mumbai
Vikram Sarabhai Space Centre (VSSC)