The best open source IDE alternative to Overleaf is TeXnicCenter. If that doesn't suit you, our users have ranked more than 50 alternatives to Overleaf and four of them are open source IDEs so hopefully you can find a suitable replacement. Other interesting open source IDE alternatives to Overleaf are TeXlipse, Latexila and JLatexEditor.
TeXnicCenter is a feature rich and easy-to-use integrated environment for creating LaTeX documents on the Windows platform. Its powerful editor and its tight integration with the LaTeX environment helps you to concentrate on what matters: The content of your document.
TeXlipse is a plugin that adds Latex support to the Eclipse IDE. It supports Syntax highlighting, Document outline, Code folding, Templates, Build support, also partial building, Annotations for errors (while editing), Content assist (completion of commands and references)...
LaTeXila is an Integrated LaTeX Environment for the GNOME Desktop, written in Vala and covered by the GPL 3 license. Here is a summary of the functionalities:
JLatexEditor is a cross-platform open source LaTeX editor. It creates a unique development environment for a user by integrating many tools needed to write LaTeX documents, and is highly configurable.
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