Free, simple, and intuitive online database diagram editor and SQL generator.
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A graph node engine and editor written in Javascript similar to PD or UDK Blueprints, comes with its own editor in HTML5 Canvas2D. The engine can run client side or server side using Node. It allows to export graphs as JSONs to be included in applications independently.
Fully hackable text editor developed for exact sciences with built-in KaTeX and AsciiMath support. Extensible via plugins and themes. Exportable as HTML, PDF and GFM.
A hybrid LaTeX code + rich-text editor. It seamlessly syncs a rich-text What You See Is What You Get (WYSIWYG) view with raw LaTeX source code, featuring real-time KaTeX math preview and one-click PDF export via online compilers.