draw.io is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams
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This is a free online mind mapping tool that is connectable with Google Drive. This is a great tool because it has a very simple interface.
Infuse Learning is a site that allows teachers to send out questions to students using any internet capable device. This site allows students to give responses in standard multiple choice, true/false, or short answer formats, but also allows them to reply by drawing an image or diagram using a laptop or tablet.
This application allows students to easily and creatively make venn diagrams, flow charts, floor plans, and much more. This can help students organize, plan, and compare works.
With this online graphing software one can construct all kinds of graphs, figures and diagrams. With the option to even export these files having professional looking figures in presentations is easier then ever.