Signal has good encryption etc, is centralized, afaik needs Google Play Services except if you use Molly; but I think it’s a bit more mainstream and simple to use for end-users

SimpleX also seems to have good encryption, post-quantum etc, and is anonymous and doesn’t even use user identifiers (they explain why that’s good on their website), so it could be good for occasional more sensitive conversations or sth (but I see people struggling with onboarding when installing it, and I still get confused by the UX sometimes). It’s kind of not even decentralized, more like peer-to-peer, with servers to just cache messages when you’re offline, I think.

Personally for day-to-day I prefer to use Matrix with Element: decentralized (which I really value for competition and user choice), e2e, and has good support for creating communities etc, so I’m lucky to have it as our main chat platform for work, and I’ve been using it for years in our hackerspace and personal chats etc. I see end-users still struggling sometimes with onboarding, but if they’re close friends/family I usually need to set it up for them anyway

Element (the matrix chat app) has a “live location” feature (I haven’t had the need to look into anything else)

traccar.org

I’m also pretty sure that I’ve seen more than one relevant Nextcloud apps, but I can’t find one right now 🤔

Thank you for posting this, this is fun! 😊

There is also zellij, which can do the same but also has modern functionality specific for development workspaces!

(Although screen or tmux will still probably be more widely available on remote machines etc)