Is there anything like LaTeXit, a Mac-only program, that converts math equations into LaTeX code, for windows?
[Tex/LaTex] n equation editor for Windows
math-modewindows
Related Solutions
Why don't you use emacs on windows? It works there.
If you are interested in working with bibtex files, there is also jabref which is a nice bibliography manager. It is fully cross-platform.
The website you point to is using MathJax to render the LaTeX. If you don't mind using a browser, then you can simply download MathJax, unpack the zip file, go into the test subfolder and open sample-dynamic.html in your browser. This is effectively an equation editor. You can make a custom web page to cater to your needs.
Note: As it is this requires you to hit the return key to render. That should be simple enough to alter. Grabbing the equation as a PNG could be a little more complex to achieve.
Best Answer
This list might be a good place to start. The third item on the list, KLatexFormula, looks promising.