The best open source alternative to ShareLaTeX is Overleaf. If that doesn't suit you, our users have ranked more than 10 alternatives to ShareLaTeX and eight of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to ShareLaTeX are Texmaker, Curvenote, SwiftLaTeX and Booktype.
Overleaf, formerly WriteLaTeX, is a collaborative writing and publishing system that makes the whole process of producing academic papers much quicker for both authors and publishers.
Texmaker is a free LaTeX editor, that integrates many tools needed to develop documents with LaTeX, in just one application.
Texmaker is not an online tool enabling collaboration.
Curvenote is a collaborative writing tool designed for open-science and reproducibility. Create & edit technical content in real-time, including equations, references, figures, and interactive plots from Jupyter, then export to any journal template.
SwiftLaTeX is a Web-browser based editor to create PDF documents such as reports, term projects, slide decks, in the typesetting system LaTeX. In contrast to other web-based editors SwiftLaTeX is true WYSIWYG, What-you-see-is-what-you-get: You edit directly in a representation...
Fidus Writer is an online collaborative LaTeX editor especially made for academics who need to use citations and/or formulas. The editor focuses on the content rather than the layout, so that with the same text, you can later on publish it in multiple ways: On a website, as a...
TexitEasy is a free, cross-platform and open-source latex editor. TexitEasy has all the features a modern editor can have.
\BlueLaTeX provides a full-featured server that allows you to create, manage and collaboratively edit documents written in \LaTeX. A web client is also provided to use the features served by the server directly in your browser.
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More and better features than ShareLatex for free! E.g. git support, version history...