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CodeShare.io - Realtime code sharing for developers
draw.io - Online diagramming application
Snipper.io - Collaborate with your friends on the same code in real time
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Code2Flow - An easy solution to create product flows.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.