They're all maintained as part of the Xed project, which link is already present in the main help about dialog.
All the the old python plugins have already been removed. Remove a bunch of the other related cruft since we want to port the plugin system to libpeas Taken from 65371f53db (diff-2bbd410468516599f21e84fecb500348)
65371f53db (diff-2bbd410468516599f21e84fecb500348)