Snowdrop uses Subversion to manage and version its code, which up until recently was hosted on the Snowdrop dedicated server with separate bug-tracking software (Mantis) and still separate collaboration software (ActiveCollab).  Well, not anymore.

Enter Versions, Beanstalk, and Lighthouse to check out code, manage and commit changes, and track issues.  Then, combine Basecamp for collaboration and Freshbooks for invoicing with Google Apps for mail, calendaring, and document storage, and Snowdrop is completely web-based (and hosted).  No software maintenance = less headaches.