Broadly, Software Company has two major categories
1. Software consulting – one can work on the IT needs of clients.
2. Software product - One find a place area where there is a need, develop a product and then start marketing it.

Things you can do to start up Software Company:

Focus Right: Software Product or Software Services?
Balancing Act: Hiring Technical Team First or Sourcing Software Projects First
Having a Business Partner or Not To Have Partner
Customer Target Location, Location & Location
Biggest Challenge: Making Sure You Will Have Ongoing Software Projects or New Web Development Projects in Pipeline
Software

3i Infotech
7Seas Tech
Accel Frontline
Acropetal Tech
Aditi Technologies
Adrenalin eSystems
Aftek
AGC Networks
Algoworks
Aptus Ind
Atom Technologies
BirlaSoft
Blue Star Infotech
Bodhtree Cons
C-DAC
CMC Limited
Cognizant
Computer Sciences Corporation
Cybage
Cyient
Cynapse
Datamatics Global Services
Dynacons Tech
Eclerx
Exilant Technologies
Experion technologies
Financial Tech
Firstsource
Flytxt Mobile Solutions
Fulcrum Worldwide
Geometric
Geometric Limited
Godrej Infotech Ltd
Happiest Minds Technologies
Harbinger Systems
HCL Tech
HCL Technologies
Healthfore Tech
Hexaware Technologies
Hinduja Global
Hinduja Venture
Honeywell
HSBC GLT India
ICSA
IGATE
Impetus Technologies
Indusface
Infinite Computer Solutions
InfoBeans
Infosys
Intellect Desig
Intellect Design
ITC Infotech
KPIT Technologies
Larsen & Toubro Infotech
Mastek
Melstar Information Technologies
Microland
Micromax Mobile
Microsoft India PL
Mindfire Solutions
Mindteck
Mindtree
Mistral Solutions
MobME
Monsoon Multimedia
Mphasis
Name
Nihilent
NIIT Technologies
Nucleus Software Exports Ltd.
NVISH
Ocimum Bio Solutions
Onward Technologies
Oracle Fin Serv
Oracle Financial Services Software
Other companies
Persistent
Persistent Systems
Plivo
Polaris Consult
Polaris Financial Technology Limited
Pramati Technologies
Quest Global
R Systems Ltd
Ramco System
Rediff.com
Rolta
Rolta India Ltd
Saksoft
Samsung India Software Center
Sankalp Semiconductor
Sasken
Sasken Comm
Sonata Software
SPAN Infotech (India) Pvt. Ltd.
SQS India BFSI
SunTec Business Solutions
Tally Solutions
Tata Consultancy Services
Tata Elxsi
Tata Interactive Systems
TCS
Tech Mahindra
Tejas Networks
Thirdware
Thoughtworks
Trigent Software
UST Global
Walkover Web Solutions
Wipro
WNS Global Services
Xansa
Xerox
Zenith Computers
Zensar Technologies
ZOHO Corporation