I'm considering trying to write one myself, but I'd rather support an existing project than start a new one.
My requirements seem pretty basic: a platform-independent, open source command line tool to read a directory of .raw tracks and output a .woz file.
I know information will be lost, but I consider WOZ to be more of a fancy bootable image than a comprehensive archival storage format.
https://github.com/aaru-dps is intriguing. Development is active but seems to be prioritized based on developer needs. A lot of issues, including tasks to add STREAM and WOZ support are labeled "help wanted", which is nice. It's written in a language I've never used before, which limits my involvement.