Amazingly functional site for working with Latex documents! For example, I am working on screencast re: containers/docker right now, and created several diagrams using their editor, see: http://i.imgur.com/NlYuaXp.png
I am a little confused. Did you use a tikz editor/assistant that they have? Or did you type your tikz just like you would with ed/vim/emacs? I did not see anything that would assist with creating tikz illustrations when I was poking around. Lowering the tikz bar would be awesome.
Amazing additions, to bad it's not open source like ShareLatex. Will probably use this when working with none techsavy people.
Shameless plug: Do you need generated LaTeX documents, or just partial pieces, like tables and plots. In that case PyLaTeX[0] is probably worth looking at.
Sounds like a good addition, but the big problem I've had with matplotlib is that the defaults are really terrible. The defaults of PGFplots are way better.
The site is way impressive. I recently produce a resume using it. One of the best features I didn't see mentioned was the fact that it either stores everything locally or in such a way that a local cookie identifies you uniquely to the server, even if you are not logged in. So if your computer happens to shutdown during editing, or if you close the tab, or whatever, returning to the website will drop you in right where you left off. The only complaint I had was the delay on auto-updating, but the manual updating was more then sufficient.
If you click on the gear icon and go to Advanced Build Options, you can turn on XeLaTeX.
It's also worth noting that you can use accented characters with pdflatex: adding
\usepackage[utf8x]{inputenc}
at the top of your preamble will usually do the job.
I personally hold the opinion that XeLaTeX should be the default anyway, e.g. Texpad app (iOS/Mac) already does this. I don't know of any downsides to choosing XeLaTeX over LaTeX.
I'd also like to see XeLaTeX become the default, but unfortunately there are still a lot of old documents and journal templates that are not compatible.
In the mean time, we try to auto-detect which engine to use, so if you load the fontspec package, for example, we'll automatically use XeLaTeX.
If this type of stuff interests you, make sure you check out http://texample.net/tikz/examples/all/ & http://tex.stackexchange.com too. Also, if you want to try and play around with it, use the "Create A New Paper" link @ https://www.writelatex.com/docs?template=paper
Here's the code I'm using: