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LaTeXDraw - LaTeXDraw is a graphical drawing editor for LaTeX.
Marmoset - Create gorgeous code snapshots.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
CodeShare.io - Realtime code sharing for developers
TikZiT - TikZiT is a graphical tool for rapidly creating graphs and string diagrams using PGF/TikZ.
Code2Flow - An easy solution to create product flows.