Agile and Tools

Most of my readers (are there any? :)) know that I'm involved with Agile development methodologies a lot. Therefore came up the question what tools do I and you suggest for using to commit yourself to Agile and related methodologies. Here is my list (a bit .NET biased):

• TFS (What else? :))
• Greenhopper - http://www.atlassian.com/software/greenhopper
• Crucible - http://www.atlassian.com/software/crucible/
• JIRA - http://www.atlassian.com/software/jira/
• Trac - http://trac.edgewall.org/
• TeamCity - http://www.jetbrains.com/teamcity/
• YouTrack - http://www.jetbrains.com/youtrack/
• Selenium - http://seleniumhq.org/
• White - http://white.codeplex.com/
• CruiseControl.NET - http://confluence.public.thoughtworks.org/display/CCNET/Welcome+to+CruiseControl.NET
• TestDriven.NET - http://www.testdriven.net/
• ReSharper - http://www.jetbrains.com/resharper/
• Hawkeye - http://www.acorns.com.au/projects/hawkeye/
• Snoop - http://snoopwpf.codeplex.com/
• NMock - http://www.nmock.org/
• Moq - http://code.google.com/p/moq/
• Pex & Moles - http://research.microsoft.com/en-us/projects/pex/
• RhinoMock - http://www.ayende.com/projects/rhino-mocks.aspx
• Sound recording, live meeting & recording, skype sharing & recording, video conferencing, etc - everything that helps supporting geo- and TZ-diversity
• Of course cork board, post-its, pins, marker pens, etc
  

What is on your list?

How do you enhance your (agile?) workload? What tools do you think I missed but is a gem itself?

A side-question: are you more of a FOSS supporter or you don't mind paying for the tools if you get priority support, continuous dependable updates, etc. when the question is your IDE/development process tool support?