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Open Source Diagram Software (2026)
Last updated: April 2026
4 software options
Sponsored
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Open platform for creating & sharing diagrams
draw.io online is a free-to-use web application with no premium paid-for functionality, watermarking, or other limitations. To use draw.io with Atlassian Confluence and JIRA, monthly or annual fees apply.
Read more about draw.io
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Multilingual open-source office suite
Apache OpenOffice is open-source and is available for free.
Read more about Apache OpenOffice
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Diagramming library for No-Code and visual applications.
We offer simple and straightforward pricing on JointJS+ license, with the option to add discounted update subscriptions and paid support plans. JointJS+ license: $3490 per license with updates for 1st year Standard Support Package - $2490 - 15 hours of support with 1 support contact. Premium Support Package - $3990 - 30 hours of support with 1 support contact. Updates renewal: $1690 per license/year
Read more about JointJS
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Network graphing RRDTool
Cacti is an open source platform, users are encouraged to donate via the website.
Read more about Cacti