When it come to 3rd party products you use when developing applications, other than Visual Studio, what are the tools or libraries you use?

This question is aimed at developers - not at those selling a product. Do not list a product you are selling or marketing, but rather only products that you or your company use.

Include planning, design, testing, debugging, performance management, deployment, or any other products that are part of your efforts.

Thanks!

Brad!
Codeguru admin