There are many software development companies in the USA, and here are some examples:

1. Microsoft Corporation
2. Google LLC
3. Apple Inc.
4. Amazon.com, Inc.
5. Oracle Corporation
6. IBM Corporation
7. Hewlett Packard Enterprise
8. Cisco Systems, Inc.
9. Dell Technologies Inc.
10. Intel Corporation

There are also many smaller software development companies across the country, including startups and specialized firms. It's worth noting that this list is not exhaustive, and there are many other companies in the industry as well.