The Free Multi Tasking Portable Operating System Contiki is an open source operating system developed for use on a number of memory-constrained networked systems ranging from the 8-bit computers to the embedded systems on microcontrollers and various devices.

A mind map is a diagram used to represent words, ideas, tasks, or other items linked to and arranged radially around a central key word or idea. Mind maps are used to generate, visualize, structure, and classify ideas, and as an aid in study, organization, problem solving, decision making, and writing.
FreeMind is a free mind [...]