You're kidding, right? Tell me you're kidding...
There's probably freeware out there that supports it (I KNOW LaTeX apps exist for Linux, at least). Problem is, it's old, awkward, and no longer the standard. It's biggest benefit was that when ASCII text editors were the state of the art it allowed researchers to submit articles in ASCII text format using a common standard. Nowadays, they use Word, WordPerfect, or Acrobat.
You can probably find the entire LaTeX standard on the web, but I warn you: it's crap. It's the single biggest cause of mental illness in scientists...