Happstack is freely available under the BSD3 license.
The easiest way to get happstack is to just install it from hackage using the cabal command.
$ export PATH=~/.cabal/bin:$PATH $ cabal update $ cabal install happstack-server
You can get and install the latest development source using darcs.
$ darcs get http://hub.darcs.net/stepcut/happstack
After you have checked out the code, you can get further updates by running:
$ darcs pull
To submit a patch run:
$ darcs record $ darcs send
Note that darcs send assumes you have a working sendmail installed. Another option is to write the patches to a file and then manually attach the patches to an email message. You should send the patches to our mailing list (email@example.com) or firstname.lastname@example.org
$ darcs record $ darcs send -o descriptive_name.dpatch
You can browse the source code online by visiting our project on hub.darcs.net.