Code2Flow - An easy solution to create product flows.
TryCode - Realtime collaborative code editor (beta)
asciiflow - Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
Codefile - Create collaborative code files & share it in real time
Flowchart.js - Draw SVG flow charts from simple text representations of the diagrams.
CodeShare.io - Realtime code sharing for developers