Hi Manuel, 1. Not that I'm aware of, I know there are a bunch of unpublished modules out there but nothing in the jamovi library 2. Yeah, this module was never committed to us so it's not available (yet) in the jamovi library. It's probably best to contact the author: https://github.com/stmueller/MTUcluster.
HI, Yeah, I started working on a k-means cluster module recently. However, at the moment there's no way to add the cluster groups to the spreadsheet making the analysis not very useful. Once we've implemented adding analyses data to the spreadsheet, I'll start working on it again.