From: Petter Reinholdtsen
There are two commercial services available, ShareLaTeX and Overleaf. They are very easy to use. -Just start a new document, select which publisher to write for (ie -which LaTeX style to use), and start writing. Note, these two have announced their -intention to join forces, so soon it will only be one joint service. -I've used both for different documents, and they work just fine. -While ShareLaTeX is -free software, while the latter is not. According to There are two commercial services available, +ShareLaTeX and +Overleaf. They are very easy to +use. Just start a new document, select which publisher to write for +(ie which LaTeX style to use), and start writing. Note, these two +have announced their intention to join forces, so soon it will only be +one joint service. I've used both for different documents, and they +work just fine. While +ShareLaTeX is free +software, while the latter is not. According to a announcement from Overleaf, they plan to keep the ShareLaTeX code base maintained as free software.