I came out of the dark after so long just to say: Launchpad is now open source!
Until today it was known that Canonical would keep Soyuz and Codehosting closed source, but for everyone’s surprise, Launchpad was fully open sourced, wisely out in the wild under the AGPLv3 free license.
If you are interested in contributing or are curious, here’s a starter: https://dev.launchpad.net. It’s the development wiki, feel free to try it out and fix wildly, after all, it’s a wiki for God sake! Read more