I personally always have one USB stick with me that has a live usb boot of Fedoraon it, but I just saw the new video from Linus tech tips and thought about extending it a bit.
He mostly talked about windows tools, but I think I will add

• https://www.ventoy.net/en/download.html for maybe an additional Linux light version
• https://github.com/TheWaWaR/simple-http-server if I have to share files from a broken Computer or so.

What are you using or do you have recommendations?