It’s a RISC-V microcontroller, completely open source, and packaged in the ever so convenient Arduino form factor ... the ARM Cortex M0+ powered Arduino Zero. According to the crowdfunding ...

The Neutrino 2.0 has been designed to provide users with an open source and expensive miniaturised version of the Arduino Zero, which is perfect for projects that require a smaller form factor.

What would you get it you mashed up an FPGA and an Arduino? An FPGA development board with far too few output pins? Or a board in the form-factor of ... for attaching small, powered sensors ...

The small development board combines the Mico:Bit’s form factor and edge ... wondered “what about an Arduino with an edge connector?!” well… I bring you the Zero:Bit!” ...

The Arduino Nano boards are worth it if your project calls for a small, lightweight microcontroller platform. Thanks to their compact form factor, they're ideal for applications, such as wearable ...

The thing with the Microduino and other custom form-factors ... something small. It fits just about everywhere the atmega328 will fit, and you can even plug it into a full-sized Arduino board ...