They are both in some way related to The Elder Scrolls III: Morrowind
OpenMW is an open source game engine that can be used to play Morrowind. (There is an unfinished "Example Suite", a CC0 licensed game data that can be used instead of Morrowind game data, so technically OpenMW does not play just Morrowind. Feel free to come help finish the Example Suite)
Skywind is remake / reimagining of Morrowind game in a modified Skyrim engine.

I was hoping for some news about how F-Droid now allows me to download more RAM.

Each entry contains explanations for why they are in a given category.
Fairphone due to having some online code activation thing for OEM unlocking. Bootloader of my FP4 has been unlocked for quite some time now, but if I recall correctly, this activation step was required for me to load custom ROM on it.
https://support.fairphone.com/hc/en-us/articles/10492476238865-How-to-unlock-and-re-lock-the-bootloader
https://shop.fairphone.com/bootloader-unlocking-code-for-fairphone
This website disappears, you can't unlock your bootloader.
That is why Fairphone is in Caution section.

Microsoft being in "safe" is a bit funny, and the explanation acknowledges that as well.
But it is there due to it containing only two Surface devices, which have easy and standalone bootloader unlock process.

CoMaps is gaining popularity.

Isn't Mattermost basically open source Slack?

Ah yes, you are correct.
Apparently the url to signup form is https://volunteers.fosdem.org/volunteers/signup

In https://volunteers.fosdem.org/ ?

It will have unlocked bootloader and quite standard SoC, so you will be able to install PostmarketOS or any other mobile Linux on it.
But in that case you might as well buy FairPhone 5 right now and do the same to it.

Impressive. Always nice to see more interoperability.

Also, I fail to see how second link has anything to do with Bluesky federation.
Oh, I see, that specific reply is from Bridgyfed.

Until it is suddenly there, while you are unprepared to do anything about it.

Matrix seems like the one with most potential to develop into a 1:1 Discord alternative.
Then you have XMPP, Mattermost, RocketChat, whatever Revolt.chat renamed itself into, etc.

Yes, and so is a virtual machine. I'm thinking install Linux to disk so that it can then run directly on hardware.