I've seen some websites, such as ones on the stack exchange, that are able to interpret and display latex code as you type. I'm curious if there are any freeware latex editors that can do that same thing... That is, compile and display in real time as the latex code is added. This will be very helpful to me to detect my errors earlier on rather than waiting until i've written a lot of code and then debug it.
there exists only one real WYSIWIG editor http://mirror.ctan.org/systems/win32/microimp/microimp.pdf, which was the first and last try to create one for LaTeX. In general: it is not possible to have a WYSIWIG editor! A user can overwrite anything of the existing code or define anything new. This makes it nearly impossible to write such an editor.
What you can have is an editor which runs in the background ???latex when the source code changes. But this implies two windows, input and output, like Gummi does: http://dev.midnightcoding.org/projects/gummi
Emacs with preview-latex does what you are looking for: http://www.gnu.org/software/auctex/preview-latex.html.
I've tried it and works but I don't like all the auxiliary files it needs to generate, so I tend to just "compile early compile often" :)
You also have something similar in the TeXMacs-project. It will give you TeX-quality output, and a pretty true WYSIWYG input.
I have never used it myself.