A cross-platform solution with data storage in industry-standard relational databases, caching proxy servers for fast distributed development, file-level workflow, seamless IDE integrations and flexible branching and labelling capabilities.
Surround SCM, by Seapine Software, is a cross-platform solution with client and server support on Microsoft Windows, Linux, Solaris, and Mac OS X operating systems. (commercial)
Bug reporting and tracking solutions. Multiple features including bug reports via e-mail, e-mail notifications, handling duplicate bugs as single bug reports, automatically generating product release notes, and attaching files to bug reports.