An exhaustive book, free and available online, on publishing workflow.

Getting, preparing, cleaning data. Exploratory analysis and modelling with regression. Creating reproducible documents with quarto. Seems really nice and good to delve into for data analysis.

Amazing cross-platform filesharing app (for sharing over wifi/LAN).

Super simple to setup, there's applications on anything from linux/windows/mac to android and ios and it's made by the linuxmint team so it's all nicely open source and free and wonderful!

A cross platform debugger for Bluetooth/TCP/UDP. Really nice serial debugger - for desktop and android