Discussion takes place on the mailing list, formencode-discuss@lists.sf.net:
Updates to the repository are emailed to the (inaccurately named) mailing list formencode-cvs@lists.sf.net:
The repository can be checked out with:
hg clone http://bitbucket.org/ianb/formencode
Note: the SourceForge CVS repository and svn.colorstudy.com Subversion repositories are out of date and no longer used.
Bugs can be reported in the SourceForge bug tracker.