There are a number of companies that offer software consulting services, but depending on your specific needs, you may want to look into the following companies:
1. Accenture: Accenture is a global consultancy that offers a wide array of services, including software consulting. They specialize in helping companies design, build, and manage custom software solutions.
2. Deloitte: Deloitte provides consulting services for a variety of industries, including software. They offer services such as strategy and implementation, application development, and testing and quality assurance.
3. IBM: IBM is a well-known technology company that offers software consulting services. Their services include custom development, enterprise architecture, and DevOps.
4. PwC: PwC is a global consulting firm that offers software consulting services. Their services include enterprise architecture, application development, and analytics.
5. KPMG: KPMG is another global consulting firm that provides software consulting services. They specialize in helping companies develop, implement, and manage custom software solutions.