[lxpz]

TeXmacs is an awesome graphical editor with full math support, that uses the TeX engine for rendering. It does not use TeX or LaTeX as its primary document structure though. It has many shortcuts for entering math that are really easy to learn and I have sucessfully used it to takes notes during lectures. I also use it as my primary work pad when thinking about complicated proofs.

[fori1to10]

TeXmacs unfortunately is a bit buggy. You get random errors from time to time, though I've never had a corrupted file. Otherwise I love it!