Preparing for the stream tomorrow, I created a small JavaScript library to read the UF2 file format. I'm still not sure if we'll use it or continue with the .hex files, but it was fun creating it nevertheless!

The source code is available here: https://github.com/wokwi/uf2 (it has a nice unit-test suite),
and it has also been published as an NPM package: https://www.npmjs.com/package/uf2.

Meanwhile, some random programmer who watched the stream started working on a RP2040 disassembler in Python: https://github.com/pyTony/rp2040

Nice work Tony! Thank you for sharing it with us :-)