Wiki
The wiki contains further general information and documentation about the project. Anything missing below should (in theory) be available there.
Download
Your distribution should provide the latest packages (see the current non-exhaustive list of dpkg downstreams). Otherwise you can get the latest released tarballs for all the supported branches. For historic releases use the Debian snapshot tarballs site, or the historic tarballs that got used during the VCS transitions.
Development
The code under development can be cloned from git, the list of repositories to browse and the instructions on how to clone them can be found in the main cgit interface. There are alternative mirrors at codeberg and salsa.
Documentation