The CouchApp source code is on Github.
This repository holds all of the code in the project. The Python couchapp script is the bulk of the repository, but the JavaScript stuff is in there to.
The jquery.couch.app.js and jquery.evently.js files are both in the vendor directory.
If you have a commit to one of the CouchApp files (JavaScript or otherwise) please let us know on the mailing list as we don't always get the messages in our Github inbox.
Also, documentation and blog posting is very much appreciated. Don't be afraid to tell us how CouchApp sucks. We want it to be very easy to use, so giving us a high bar to reach is important.