CmapTools is free for commercial use and allows users to construct, navigate, share, and criticize knowledge models represented as Concept Maps. The toolkit is platform independent and network enabled.
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Pro Web version
Web-based, online version of CmapTools available. It is also possible to install your own CmapServer.
Pro iPad app
An iPad app is available.
Con HiRes bug
Being a Java Swing application, High Resolution monitors are not handled well under Windows 10. This is a documented Java bug.