Warzone 2100, a free and open-source RTS (single-player campaign, local skirmish vs AI bots, LAN play, online multiplayer)
We’ve recently done some extra work to make the Snap experience even nicer (auto-downloading a content snap for the campaign video sequences, as one example).
I’d throw a shout for Joplin via joplin-james-carroll package.
Joplin is a cross platform (Desktop & Mobile) libre licensed notetaking application. It’s professional quality and stands up amongst its peers very well. It supports E2E encryption on the users own selected sync platforms (Dropbox/OneDrive/WebDAV/etc) so fits itself well to the privacy minded Linux community, and has had several months of testing in the snap packaging. It’s no surprise that it’s finding itself as one of the more renowned options for notetaking applications, but I’m sure there’s plenty who are yet to be exposed to it who might benefit.