ZoomCharts - Creating meaningful and aesthetically pleasing data visualizations and incorporating them into your projects is easy with the tools offered by ZoomCharts.
draw.io - Online diagramming application
Google Charts - Interactive charts for browsers and mobile devices.
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.
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.