I've added the following myself:
* mattermost
* purple-signald (waiting for https://github.com/NixOS/nixpkgs/issues/188384)
* purple-events
* purple-libnotify
and added slack from nixpkgs.
I'm also trying to make signal integration work.
Not sure whether I'll keep pidgin, as I expect video calls from within
slack not to work.
But would be cool to have a single open source messenger instead of x
instances of chromium as wrapper around closed source web applications.
Do not create desktop item in file system, instead use proper xdg
configuration option. That way we do not need to hard code location of
file and can use a proper set with validation from module.
Daniel Siepmann