For forecast, you can selfhost a Open-Meteo. But note this need a lot of RAM and storage to run the weather model.

https://github.com/open-meteo/open-meteo

I use digiKam and do sync manually.

https://www.digikam.org/

Will it work well with existed IME like Fcitx5? Or I can choose only one of them?

I see Qt Virtual Keyboard has their own InputMethod implementations, but I think it's not a good idea to re-invent a new IME when there is no obvious advantage, because InputMethod is not a simple thing in some languages like Chinese and Japanese.

For example, libime, the core algorithm library of fcitx5-chinese-addons uses 47k SLOC to implement a good pinyin input method algorithm, even not count the Trigram language model, which is around 30MiB.

As a comparison, the pinyin algorithm of Qt Virtual Keyboard (it seems come from deprecated AOSP's PinyinIME) uses only 8k SLOC. And PinyinIME was give up by AOSP since 2014, it never updates since that time (and no algorithm update since 2009). At 2018, Qt pull it into Qt Virtual Keyboard and never do actual algorithm optimization. So it has fallen away from the time.

I'm looking for a Android SSH application with FIDO2 *-sk support. But I found none of them are open source and non-subscription. Termux is open source, it's good, but their libfido2 is unpatched so can't communicate with security key via USB or NFC on Android. ConnectBot is also great, but it lacks maintenance and doesn't support *-sk as well.

Choose the keyboard use QMK firmware or support VIA. Their configuration will be store in flash on keyboard permanently. VIA or QMK Configurator are just a "configuration writer".

NVS 3100M has codename NV50 (Tesla), so you can see the feature matrix.
https://nouveau.freedesktop.org/FeatureMatrix.html
https://nouveau.freedesktop.org/PowerManagement.html
So you can see almost other things has been done but the power management especially Automatic Reclocking still unfinished. So the feature set and stability should be fine and the performance will be bad.

I print recovery codes of all services and packed them into a bag.

So use Fcitx 5 Android instead. It's a open source IME application without requesting any permission except Notification, especially without network permission.

https://github.com/fcitx5-android/fcitx5-android

I use Yubikey 5 NFC and Canokey Pigeon, both works out of box on Linux.

I don't think Sidebery is a great implementation unless the developers fix this bug. It can be reproduced stably and is important for users who opened many tabs and keep them between session.

https://github.com/mbnuqw/sidebery/issues/1368

Konsole, because I can use it in editor(Kate), file manager(Dolphin), IDE(KDevelop), standalone window and Quake style window.

Use a git repo and stow tool. For updating, you only need run git pull (and stow if you create config for a new software). If you modify some config, just git add && git commit && git push.
With this way, you can also record change history of your config.