Official
Many versions of the official Arduino hardware have been commercially produced to date: See also list of Official Arduino BoardSuperseded
The following have been superseded by later and more capable versions from Arduino.Compatible
Although the hardware and software designs are freely available underFootprint-compatible
The following boards are fully or almost fully compatible with both the Arduino hardware and software, including being able to accept "shield" daughterboards.Special purpose compatible
Special purpose Arduino-compatible boards add additional hardware optimised for a specific application. It is kind of like having an Arduino and a shield on a single board. Some are Shield compatible, others are not.Industrial grade
Software-compatibility only
These boards are compatible with the Arduino software, but they do not accept standard shields. They have different connectors for power and I/O, such as a series of pins on the underside of the board for use with breadboards for prototyping, or more specific connectors. One of the important choices made by Arduino-compatible board designers is whether or not to include USB circuitry in the board. For many Arduino tasks, the USB circuitry is redundant once the device has been programmed, so that circuitry can be placed in the cable between development PC and board, thus making each instance of the board less expensive, potentially smaller, and more power efficient.Non-ATmega
The following non-ATmega boards accept Arduino shield daughter boards. The microcontrollers are not compatible with the official Arduino IDE, but they do provide a version of the Arduino IDE and compatible software libraries.Non-Arduino
The following boards accept Arduino shield daughter boards. They do not use microcontrollers compatible with the Arduino IDE, nor do they provide an alternative implementation of the Arduino IDE and software libraries.References
Further reading
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* {{commons category-inline, Arduino compatibles Arduino