linuxoveruser

Nix is probably the best way to get all of those things set up without shipping a whole distro, but there will be a bit of a learning curve. If you’d like something a bit easier to set up for development (still based on Nix), I’d recommend devenv.sh.

Maybe Discourse? The mobile website is pretty good and there are also a number of third-party mobile apps.

I really like immutable distros, and am currently using NixOS. I feel like despite still being relatively obscure, NixOS is a bit of an outlier since it has more packages than any other distro and is (so far) the only distro I’ve used that has never broken. There is a steep learning curve, and I certainly wouldn’t recommend it for non programmers, but it is something truly different than all mainstream Linux distros while being extremely reliable.

nextcloud provides apps for both calendars and lists, if you’re comfortable getting into self hosted services. of course, there are a number of other self-hosted apps that provide similar functionalities as well, but nextcloud is probably a good place to start

Check out Lychee. It’s designed for (semi) public photo galleries more like Flickr

I recently switched from Google Podcasts to Podcini (fork of Antennapod) and it’s great so far

NixOS

I love NixOS, but the documentation is terrible. Better documentation would go a long way to making it a more user-friendly platform.