These packages are usually development snapshots. They may change without further notice even though the filename and version number stayed the same. They may or may not be identical to official Debian packages. Use at your own risk.
There is an aptable repository at http://noone.org/apt/ for most those packages.
There are also automatically built .debs of nightly conkeror snapshots available at http://noone.org/conkeror-nightly-debs/.
Generally, have a look at https://github.com/xtaran and http://git.noone.org/.
Looking at the list myself makes me notice that there are still a few repos to migrate from Mercurial to Git…