Code2Flow - An easy solution to create product flows.
TryCode - Realtime collaborative code editor (beta)
Flowchart.js - Draw SVG flow charts from simple text representations of the diagrams.
Codefile - Create collaborative code files & share it in real time
DIagrams Through Ascii Art - Java command-line tool to convert ASCII diagrams to bitmaps.
CodeShare.io - Realtime code sharing for developers