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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.
Pencil Project - Single-user mockup / wireframing / diagramming tool
draw.io - Online diagramming application
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
LibreOffice - Draw - Draw, LibreOffice, ODF, open standards, creative software, vector drawing
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.