Patoline typesetting system
There is https://patoline.github.io/ but it's been in alpha / active development for years now.
I agree that TeX's errors is one of the worst things about it. Strongly suggest you track your changes in git, I found it was often easier to go back to some version that compiled and re-add the changes, rather than try and track down the missing bracket or extra backslash that broke it.
Universal markup converter
Pandoc allows you to work in a variety of input and output formats.
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Learnlatex.org: A place to learn LaTeX online
5 projects | news.ycombinator.com | 17 Mar 2021
Batch convert .doc to .epub
1 project | reddit.com/r/Calibre | 1 Dec 2022
latex alternative that works with word?
4 projects | reddit.com/r/LaTeX | 21 Nov 2022
I'm looking for a maths notation app
2 projects | reddit.com/r/opensource | 16 Nov 2022
recursion: good a bad use cases
1 project | reddit.com/r/learnprogramming | 14 Nov 2022