https://beej.us/guide/ Beej’s Guide to Network Programming, Unix Interprocess Communication, Python Programming, C, the GNU Debugger (GDB)
https://www.danstools.com/ Tools and links to CSV To HTML/JSON/TSV/XML Converter and other way around, base64 decode/encode, binary to decimal/hex/octal/string, json validator, RegEx Testing etc.
Arcan – display server like X, wayland https://github.com/letoram/arcan/wiki
https://kreya.app/ Open Source tool like postman
https://github.com/motioneye-project/motioneye Frontend für motion
https://duncanlock.net/blog/2013/05/13/using-udf-as-an-improved-filesystem-for-usb-flash-drives/ Using UDF as a USB stick filesystem