Open Source Embedded Controllers ( Arduino boards, Raspberry Pi boards, Gemma, Beaglebone)

Raspberry Pi (RPi) is a credit card sized computer. It has ARM based Broadcom Processor SoC (System on Chip) along with on-chip GPU. Unlike Arduino board, one can connect all the peripherals like monitor, keyboard, mouse, camera etc., and use RPi board like a full-fledged computer. It also provides access to on-chip hardware. Raspbian OS is the official open source operating system to be installed in RPi board. Available boards: Raspberry Pi 2, 3, 4
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Available Arduino boards- Uno, Mega, Mini, Gemma.
BeagleBone Black is a low-cost, community-supported development platform for developers and hobbyists
Processor: AM335x 1GHz ARM® Cortex-A8
Connectivity: USB client for power & communications, USB host, Ethernet, HDMI, 2x 46 pin headers
Software Compatibility: Debian, Android, Ubuntu, Cloud9 IDE on Node.js w/ BoneScript library, plus much more