This is what I use. Not amazing, but given it's possible to use Messenger through it as well if needed, it's better than nothing.
I'd been on the waitlist for more than a year, but finally on. I downloaded the app a little while ago to keep tabs on my progress through the waitlist and they definitely have been speeding up the process of getting people onboarded to be fair.
SlimSocial is the only one that I've found that still works, though might require some messing with the settings to get Messenger working through it.
Matrix bridges are an option for those willing to put the effort in and self-host. I might get round to doing this at some point.
It's not open-source, but I've settled on Beeper for the time being as the simplest option to get all my messages in one place.
This looks really nice. Was using Prognoza for a while, but ended up back with the BBC Weather app here in the UK as I couldn't find a good open source app that showed allergy/pollen information.
This does seem to show allergens for some areas, though not all. Possibly a bug given the provider (AccuWeather) does provide it for each area on their website. If that's fixed I'd probably be able to use it exclusively.
I've currently settled with Liftoff. I got very used to Jerboa and was perfectly happy with it, but the last few updates broke it to the point of unusability for me.
Liftoff isn't perfect, though its pretty good. My biggest gripe is that as far as I can tell there's no button to go straight to the top of the feed, which is really annoying when you've been scrolling for ages and have to scroll all the way back up. Hopefully that will be added soon.
This is genuinely very cool and has made me nostalgic enough to consider trying to get hold of one for my Game Boy! I only wish I had some photography talent, as it's quite a feat to take good photos with something so technically rubbish.
I've been using Tasks.org which syncs with my Nextcloud perfectly. Had tried quite a few before settling on this as the best option.
Yes, it is still OK to use those services. The law is aimed at the messaging/social media businesses, not individuals, and is vague enough that they won't have to do anything around their E2EE until there is viable technology available to square the circle of allowing for the checking of illegal abuse content while not functionally destroying E2EE. So potentially never.