Browse free open source Diagram software and projects for Windows below. Use the toggles on the left to filter open source Diagram software by OS, license, language, programming language, and project status.
Security-first diagramming for teams
Diagram and flowchart generation from text similar to markdown
The Pencil Project's unique mission is to build a free tool
UCanCode Visio 2023, the best replace of Microsoft Visio
Fingering chart generator for brass wind instruments
Business graphics diagramming application + customizable shape lib.
Circuit diagram editor with device editor
JavaScript diagramming library for interactive flowcharts & org charts
Steganography and steganalysis software