For .NET environment:
- SVN server: VisualSVN server (free)
- SVN client: AnkhSVN 2.0 (open-source)
- Continuous Integration: CruiseControl.Net (open-source)
- Bug tracker: BugTracker.NET (open-source). But if you can, i would recommend Trac.
I am very satisfied with Assembla - they host SVN server and Trac for your projects for very reasonable prices (or for free if the oproject is public).
