Here are some well-known IT / software companies in Chennai with their addresses, and also a few IT parks / office complexes. This should give you a good idea of where tech firms are located in the city. I can give you more (or updated) ones if you tell me which domain (product / services) or area (OMR, Guindy etc.) you prefer.
BERLIN SOFTWARES PVT. LTD.,
Address: #5/425, Old Mahabalipuram Road,
Karapakkam, Chennai - 600097.
Tamil Nadu, India.
Tel: +91 988 4244 111.
EmaiL: info@berlinsoftwares.com
Website: https://berlinsoftwares.com
BESTIR Software Services Pvt. Ltd.,
Address: Old No.263/1, New No.96/1, 1st Floor,
Royapet high road,
Opp: EPF, Chennai - 600014.
Tamil Nadu, India.
Tel: +91 044 4850 8689
EmaiL: contact@bestirtech.com / sales@bestirtech.com
Website: https://bestirtech.com
Bexhin
Address: 821, 8th Floor,Pantheon Road, Samson Towers,
Egmore Village, Chennai - 600008
Tamil Nadu, India.
Tel: +91 89254 71529
EmaiL: sales@bexhin.com
Website: http://bexhin.com/
BeyondFinity
Address: No. 3 Ground Floor,
26/216 GG’s Sri Rajeswari,
Gandhi Road, Velachery, Chennai - ,
Tamilnadu – 600042 INDIA
Tel: +91 996 221 4222
Website: https://beyondfinity.com/
Bharath Technologies
Address: # 83, Kaliamman Koil St, Advent Chruch Opp,
Virugambakkam, Chennai - 600092.
Tamil Nadu, India.
Tel: +91 9380083338
EmaiL: support@bharathtechnologies.com
Website: https://bharathtechnologies.com
BHASH SOFTWARE LABS
Address: 267 - A , Kilpauk Garden Road ,
Kilpauk Garden, Chennai - 600010
Tamil Nadu, India.
Tel: +91 9543927979 / 9015095555
EmaiL: support@bhash.com / manoms@bhash.com
Website: https://bhashsms.com/
Bhive Technologies
Address: 5/10 Door no 3B, 3rd floor, Subikisha Apartment,
Trustpuram 6 th cross street,
Kodambakkam, Chennai - 600024.
Tamil Nadu, India.
Tel: +91 94980 51336
EmaiL: official@bhivetechnologies.in
Website: https://bhivetechnologies.in
Big Apps
Address: 1, Deivanai Street, Karthekeyan Nagar,
Maduravoyal, Chennai - 600095.
Tamil Nadu, India.
Tel: +91 9840106177
EmaiL: sales@bignetwork.in
Website: https://bigapps.in
BGS
Address: W358, North Main Road, C-Sector,
Anna Nagar West Extension,
Chennai - 600 101.
Tamil Nadu, India.
EmaiL: info@bigeyeglobal.com / hr@bigeyeglobal.com
Website: https://bigeyeglobal.com/
Bigspire Software
Address: RMZ Milenia Business Park. Phase 2, Campus 4B,
No 143,6th Floor, Unit 602A,
Dr. M.G.R Road, Kadanchavadi,
Perungudi, Chennai - 600096.
Tamil Nadu, India.
Tel: +91 044 71645747
EmaiL: info@bigspiresoft.com / sales@bigspiresoft.com
Website: https://bigspiresoft.com/