The best open source alternative to Lucidchart is Excalidraw. If that doesn't suit you, our users have ranked more than 50 alternatives to Lucidchart and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Lucidchart are LibreOffice - Draw, Dia, Freeplane and PlantUML.
Excalidraw is an open-source whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them. Available directly online as a web app and also through CodeSandbox to easily see how the code works, and the app is available for self-hosting.
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
Open-source diagram editor supporting Linux, Windows, Unix, and Mac OS X, with features for constructing entity relationship, UML, flowchart, and network diagrams, customizable with XML-defined shapes, extensibility, and a GTK+-based graphical user interface.
Freeplane is a powerful and free software for building mind maps. It is a redesigned version of the well known FreeMind , and is created by one of FreeMind's key developers.
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere within JVM and integrated with various application such as wiki, text editor, IDE, programming language, documentation generator, and others.
Efficient web-based tool for constructing high-quality commutative diagrams. Offers LaTeX export with embedded links, intuitive interface supporting both mouse and keyboard inputs, and features like multiple selections, macro support, and smart label alignment.
VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts. Such maps can help you to improve your creativity and effectivity. You can use them for time management, to organize tasks, to get an overview over complex contexts, to sort your ideas etc.
TiddlyMap is a TiddlyWiki plugin that turns your favourite personal note taking software in a wiki-concept-map hybrid! Yes, you will be able to do both: drawing maps and putting down knowledge in a wiki way.
Gaphor is a WYSIWYG (What You See Is What You Get) UML and SysML modeling environment easy to use that will help you create your applications.
Power users need more than a scrolling chat. Kavim gives you a visual canvas to branch AI conversations, map reasoning and keep everything in view. Local, fast and built for deep thinking without extra AI costs.
Your GitHub issues. Actually usable. Stop alt-tabbing to update tickets. Hit a hotkey, click a checkbox, keep coding.
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