Sometimes we need to draw our idea or business flow so other people can easily understand our idea. I found one good online software to draw diagram . It's free and no need to install anything, just open it using browser (Firefox, Google Chrome, Safari, etc) .
it's Diagramly. Diagramly is diagramming application that enables you to draw Flowchart, UML, Database structure, Business Process, organization structure, etc. You can save your works as Vector, Jpg, Png, XML .
You can access Diagramly @ http://www.diagram.ly/ or if you use Google Chrome you can install it into it https://chrome.google.com/webstore/detail/plgmlhohecdddhbmmkncjdmlhcmaachm ( You can save your works into Google Drive )