Sahana now comes in two flavours
The development of a new codebase for the Sahana project has begun: SahanaPy.

SahanaPy is a ground-up rewrite of Sahana Phase 2 for web2py, which is a MVC web application framework for Rapid Application Development based on Python. The SahanaPy codebase also introduces distributed version control with Bazaar – with the main repository currently hosted on Launchpad.
Links: