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Lucid Chart is an online platform for creating powerful diagrams and flowcharts that can be used for creating presentations and for visual communication with your audience. It has a free and a number of paid packages that provide rich features for creating mockups, wireframes, importing MS Visio files, mind mapping, etc. Lucid Chart also provides online collaboration options so that you can conveniently interact with others users when creating your diagrams. Moreover, you can later use these diagrams and charts in PowerPoint .PPT files to enhance the presentations.

"Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts. Cacoo can be used free of charge."