The best Diagram Editor alternative to Theory Maker is PlantUML, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Theory Maker and five of them are Diagram Editors so hopefully you can find a suitable replacement. Other interesting Diagram Editor alternatives to Theory Maker are Graphviz, OmniGraffle, Penrose and Ideament.
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.
Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design...
OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click.
Penrose is a platform that enables people to create beautiful diagrams just by typing mathematical notation in plain text. The goal is to make it easy for non-experts to create and explore high-quality diagrams and provide deeper insight into challenging technical concepts.
Lets you easily draw a diagram - mind map, concept map, or flow chart - and convert it to a text outline, and vice versa.
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