The Foolscap Trac Instance Is Here, and is probably more useful than this page. Please use it for all bugs and patches.
Please see the Foolscap wiki page for a description of the Foolscap protocol and project.
The most recent release is foolscap-0.12.3 (gpg signature, using key 0xAF1B4A2A). Older releases are available here.
Source code is available on Github.
Foolscap is distributed under the terms of the MIT license; the same terms that Twisted uses.