Here's something I've been working on for my own "pleasure", but after posting elsewhere, the tools proved to be useful for some. This is a web-based set of tools for working with Atari ST disk images (.ST, .MSA) that runs entirely in your browser and can be used off-line. The source code is transparent. Your files are never uploaded to the server. You can also create blank disks and add files to them. There's also a TOSEC lookup tool implemented so if you upload a disk image with matching hashes, you'll have additional options to play with. But, wait, there's more
https://krystone.pl/st/disktools
