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yEd – Graph Editor by yWorks
yED is a powerful desktop application that can be used to quickly and effectively generate high-quality diagrams. It is well suited for creating functional block diagrams of project hardware as well as state diagrams and flowcharts for project software.
Digikey’s SchemeIt
Scheme-it is an online schematic and diagramming tool that allows anyone to design and share electronic circuit diagrams. The tool includes a comprehensive electronic symbol library and an integrated Digi-Key component catalog that allows for a wide range of circuit designs. Additionally, a built-in bill of materials manager is provided to keep track of parts used in a design. Once a schematic drawing is complete, users can export it to an image file or share it via email with others. Scheme-it works natively in all major web browsers without requiring the use of any plugins. Only registered users are able to share and save designs.
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Circuit Diagram
Circuit Diagram is an open-source, easy to use Windows based program that is useful for creating simple circuit diagrams.