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Looking at this question, I wonder what good and useful web services are out there. For example the LaTeX symbol classifier looks interesting. You can draw a symbol with your mouse and get back the LaTeX name of that symbol (the software analyzes your drawing). There are many others out there. Which one do you use regularly? Please provide a link and a short description.

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As it stands, I feel that this question is too broad and imprecise. What do you mean by "web service"? I can download detexify and run it on my own machine, or I can install a TeX-server via apache, so what distinguishes a "web service" from a non "web service"? –  Loop Space Sep 23 '10 at 8:48
    
I mean "a web page that you can visit". So you only need a browser to access something that is useful for your (daily) TeX/LaTeX/ConTeXt work. I am not talking about wiki pages or blogs or similar. The MathTran project is such an example. There must be many more out there. –  topskip Sep 23 '10 at 8:54
    
+1 for advertising the LaTeX symbol classifier! –  Niel de Beaudrap Sep 23 '10 at 12:14
    
Table 1 of this paper lists a bunch of vulnerable web previewers, including some mentioned in the answers. –  TH. Sep 26 '10 at 1:23

10 Answers 10

Google Docs

Google Docs supports LaTeX equations.

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LaTeX Lab

http://docs.latexlab.org/ supports full LaTeX inside Google Docs with realtime PDF preview.

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DeTexify

This was mentioned in the original post but deserves its own mention in the answer section.

DeTexify (and the iPhone/iPod app) allow you to draw a symbol and a neural network backend will provide a list of likely LaTeX commands to create the symbol.

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Uniquation

http://uniquation.com is a math search engine that indexes and searches formulas represented in a tex format.

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At Scribtex you and collaborators can edit and compile latex files. With the free version you can have three projects with one collaborator per project. For more you have to pay.

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My go-to-web favourite is this nice little Online LaTeX Equation Editor for making the business of assembling complex math LaTeX code a complete non-brainer. The interface is very intuitive and the online preview makes it easy to immediately see what's going right and wrong. Its preview function extends its usefulness well beyond the TeX domain. You can select a good range of display options (typeface, font size, colour, transparency, dpi, etc.), then download its output in one of a number of formats (gif, png, pdf, etc.) for those times you or non-TeX others might want to embed LaTeX-typeset formulae into non-TeX applications.

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mathurl You input a formula in a box and get an instantaneous render (as png) which you can then shorten and embed. They support amsmath and have shortcuts on the side for common symbols, operators, font styles etc. Great for tossing in an equation or two in an email or forum post on the fly.

Example:
Example

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Welcome to TeX.sx! I embedded the image for you. Hopefully, you'll soon have enough rep to do so yourself ;) –  doncherry Jan 4 '12 at 13:00

This web app seems fairly new and does a good job of recognizing hand-written equations. It works on iPhone or iPad so you can draw equations better than with a mouse. In return, it provides an image of the equation and the LaTeX or MathML code: http://webdemo.visionobjects.com/equation.html

OCR on an equation

Image from: What is the status of generating LaTeX from handwriting (i.e., OCR)?

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A collaborative LaTeX writing environment: https://www.sharelatex.com/

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WriteLaTeX is another option: http://writelatex.com/

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