List of software that I find myself using a lot and that I recommend.
Windows
Useful when you have a laptop and an external keyboard with a different language, it detects you using a different keyboard and automatically switches language.
Multi-utility by Microsoft, extends Windows with some useful quality of life improvements.
I prefer to have the slides and other course material in one big PDF file to scroll through. This software has been the best so far.
PDF reader which remembers the last opened files. Best content/window size ratio so far.
It works with basically everything thanks to the extensions, fast start-up.
Music player with a lot of supported codecs.
Video editor, free, open source. Tons of encoders/decoders support thanks to the ffmpeg backend. If you only need to crop, cut or zoom this is my goto editor.
Android
Note taking app
Reader for all types of documents, it just works and it’s fast.
File Manager plain and simple. No ADS and useful extensions for SMB.
Good series/movie catalog manager for both local and network storage. I use it together with the next recomendation.
Video player, personally I found it more stable than VLC and with a better UI than mpv-android.
So far the only music player that doesn’t randomly crash or run out of memory. Also foobar2000 passes that bar but at least for AIMP the UI is usable.