DocuSign - Try DocuSign's interactive signing demo now! Send yourself an electronic document to digitally sign using our e-signature service.
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.
RightSignature - Contracts, NDAs, forms, you name it — all signed online in minutes
draw.io - Online diagramming application
Scrive - Scrive is a solution to e-sign documents via email, SMS, tablet or integrated into a webpage.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.