Broken links for stex
https://gl.kwarc.info/kwarc/kwarc.info/www/-/blob/master/systems/sTeX.md
Some sTeX-based libraries of active doucents on MathHub.info: SMGloM, active course notes.
These links to https://mathhub.info/smglom and https://mathhub.info/MiKoMH are now broken.