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Top UML GitHub Repositories & Tools (2026)

Discover the most starred and trending open source tools tagged with #uml.

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5 matching projects · updated Sep 28, 2026 How we rank ↗

#1 TRENDING mermaid-js/mermaid TypeScript 2014

Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown

◇ diagrams ◇ diagrams-as-code ◇ documentation ◇ flowchart

9.3K ↑ +7 today

90.4K

#2 TRENDING umple/umple Java 2015

Umple: Model-Oriented Programming - embed models in code and vice versa and generate complete systems. Save yourself lots of coding. Do it collaboratively online in UmpleOnline, in an IDE or on the command line.

◇ class-diagram ◇ code-generation ◇ editor ◇ low-code

208 ↑ +1 today

278