All sources for my development projects I store at
Free users have almost the same services scope just limited by space:
- projects (in free plan the source is open for anyone), milestones and tickets
- SVN/Git repository (you can close/refer tickets by commit messages)
- wiki with several mark-up languages
- team collaboration tools
- agile tools
I started from hosting files of my FireFox addons there — SVN and wiki make it perfect choise.
Then I got used to the handy and comfortable interface so much that became a paied user — for xUSSR person it’s worth mentioning 🙂
And the last but not the least — Assembla team is very open and keeps in touch with their users.