Command line tools for Minecraft
Run mcl reset-lighting path/to/region-file/r.3.-1.mca. This will delete the isLigthOn, BlockLight and SkyLight entries from all chunks, reseting the chunk lighting info.
This is meant to prune chunks based on InhabitedTime as an alternative to the equivalent functionality in mcaselect.
Search and print the positions of specific blocks. I used this to compare diamond distribution between 1.20.1 and 23w31a.