Import/export .x files in Blender 3.0 (and some earlier versions). The *Poikilos fork* attempts to maintain compatibility with the latest stable Blender and allows install via GUI (Click "Code", "Download ZIP"--See "Install" in readme for the rest of the steps). Related project (also recently updated): https://github.com/ldo/blender-addons-orphaned
Fixes some errors that popped up while trying to run the script in Blender 3.0, also fixes some errors occurring while importing meshes and armatures.
I did not test if this will still work in 2.80 or if 2.80 will still be supported, however.