The firebird 2.1 RC1 release is currently being tested – binaries soon

The v2.1 release branch has just been forked off from HEAD, all the v2.1
specific changes will go there. The RC1 release is currently being QA’d,
the binaries will be available shortly.

HEAD is now open for commits and represents the v2.5 development cycle.
The B3_0_Transition branch will be merged into HEAD later this week.

Dmitry