Mind mapping and brainstorming are great ways to overcome problems of writers' block or a dearth of ideas. Idea Sketch is a free iPhone and iPad app that can be used to create flow charts, mind maps, organisational charts, concept maps and much more.

The minimalist interface leaves you free to concentrate on getting some rough ideas onto the screen - just create a shape and add text and the app will take care of any additional line drawing for you.

Whatever type of project you are working on, Idea Sketch makes it easy to brainstorm ideas and create outlines for projects you are working on.

Completed diagrams can be saved as images in your camera roll so they can be easily transferred to your computer and from there you can then upload them or share them with others.

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A simple yet effective diagramming tool that can help you get out of an ideas black hole.