For anyone who might be interested - I just updated my animator and tested it on Linux (main target is MonoGame). Seems good so far. It allows you to use a few keyframes and pose/distort parts to create stuff like this:
Just thought I’d put it out there in case someone needed a cheap or free alternative. The runtimes are 2 simple classes which you can add to your monogame project. There are versions for other platforms too which need updating (altho everything is made to be reverse and forward compatible).