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.
[Tex/LaTex] What useful web services are out there
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Best Answer
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.