There is also a fork of TeXmacs called Mogan https://github.com/MoganLab/mogan
What was the main motivation for the fork? Looks like texmacs itself is still actively maintained: https://github.com/texmacs/texmacs
alt Hacker News
What was the main motivation for the fork? Looks like texmacs itself is still actively maintained: https://github.com/texmacs/texmacs