The latest version of bbPress is 2.5.13, released on May 18, 2017, and requires WordPress 4.7.
bbPress 2.6 Release Candidate 3
The upcoming version 2.6 of bbPress is coming soon, we’ve released a new beta for testing.
To contribute to bbPress development, check-out the most recent revision from our Subversion repository.
svn co https://bbpress.svn.wordpress.org/trunk/
Download the latest development version, which is exactly what we run here at bbpress.org:
For older versions of bbPress (before 2.0) visit the legacy downloads page.