Xfig is an interactive drawing tool which runs under X Window System Version 11 Release 4 (X11R4) or later, on most UNIX-compatible platforms, and e.g. under Darwin on the MacIntosh and any X server under Microsoft Windows.




Penrose is described as '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' and is a Diagram Editor in the business & commerce category. There are more than 50 alternatives to Penrose for a variety of platforms, including Windows, Mac, Web-based, Linux and Self-Hosted apps. The best Penrose alternative is draw.io, which is free. Other great apps like Penrose are LibreOffice - Draw, yEd Graph Editor, Microsoft Visio and Mermaid.
Xfig is an interactive drawing tool which runs under X Window System Version 11 Release 4 (X11R4) or later, on most UNIX-compatible platforms, and e.g. under Darwin on the MacIntosh and any X server under Microsoft Windows.




The PlantText tool is an online tool for quickly creating UML (Unified Modeling Language) diagrams. Unlike most tools, PlantText can build diagrams without the use of a mouse because it is based on PlantUML markup language.



Theory Maker is a free web app by Steve Powell for making any kind of causal diagram, i.e. a diagram which uses arrows to say what contributes to what. You make the diagrams just by typing the names of the elements (called variables) in a structured way into a (resizeable)...




Linkurious provides a graph visualization and analysis platform used for fraud detection, anti-money laundering, intelligence or cybersecurity. Easy to deploy and highly extensible, Linkurious Enterprise makes it easy to uncover insights hidden in complex connected data.


Social Network Visualizer (SocNetV) is a cross-platform, user-friendly application for the analysis and visualization of Social Networks in the form of mathematical graphs, where vertices depict actors/agents and edges represent their relations.




Diagrams is a powerful, flexible, declarative domain-specific language for creating vector graphics, using the Haskell programming language.




A graphical editor for dot files for use with GraphViz to generate diagrams.




blockdiag and its family generate diagram images from simply text file.
Features:
Supports many types of diagrams block diagram (w/ blockdiag) sequence diagram (w/ seqdiag) activity diagram (w/ actdiag) logical network diagra.

Asymptote is a powerful descriptive vector graphics language that provides a natural coordinate-based framework for technical drawing. Labels and equations are typeset with LaTeX, for high-quality PostScript output.
KeyLines is a JavaScript toolkit used by developers to build powerful network visualization applications, quickly.



