You can test Boolean data type in new flamerobin snapshot (Firebird 3.x)

Firebird 3 introduces the boolean datatype. See the Firebird 3 release notes, BOOLEAN data type. 
Now you can test it in flamerobin snapshot 
Thanks to this pull request on github :)

New Flamerobin snapshot flamerobin-0.9.3.c75f861 ready for testing (Win32)

New Flamerobin snapshots flamerobin-0.9.3.c75f861 for Windows are available (x86)
http://sourceforge.net/projects/flamerobin/files/flamerobin-snapshots/0.9.x/
You will need Visual C++ Redistributable for Visual Studio 2015 (x86)
https://www.microsoft.com/en-US/download/details.aspx?id=48145
You can check Git log for code changes
https://github.com/mariuz/flamerobin/commits/master
Enjoy, and please be sure to report any bugs, regressions or suggestions on flamerobin-devel list or in the git bug tracker
https://lists.sourceforge.net/lists/listinfo/flamerobin-devel

On Ubuntu/Debian you can follow the Buiding guide from git to obtain the latest snapshot source

http://flamerobin.org/dokuwiki/wiki/howtobuildonubuntudebian