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asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Diagrams for Mac - A diagram editor for visualizing structures and processes
Charaster - Open-source ASCII art editor for browser-based, raster-style editing
Screenshot Flow - Super fast app diagrams to communicate design
PathVisio - Open-source and free pathway analysis and pathway drawing software. Allows drawing, editing and analysis of biological pathways.
Plectica - Easily diagram anything, together