Which vendors offer free licenses for use of their products in F/OSS projects?

Question

Which vendors are known to offer free licenses of their otherwise paid and propreitary software in support of Free and Open Source Software (F/OSS) projects?

Where possible, please provide a link to the product and the page where the free license offer for F/OSS projects is mentioned. For example, “Open Source License for ReSharper by JetBrain”

Answer 1

Here's a few:

• Atlassian (e.g. for JIRA): Open Source Project License Request
• TestDriven: TestDriven.Net - Download (see Personal Version)
• Visual SVN: Request Open Source Developer License
• Balsamiq: Get Mockups For Desktop For Free (scroll down)