draw.io - Online diagramming application
Infogram - Make charts & infographics that people love
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.
Mind the Graph - Infographic maker for scientists
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Visme - One easy to use online tool to visualize your ideas to engaging Presentations, Infographics and other Visual Content.