Boards from other manufacturers that are compatible with the Arduino IDE
Circuit Playground - Developer Edition is a combination of sensors and Led's that helps you with all your projects involving Arduino.
Pro Trinket 5v is an advanced version of the original Trinket with 5V,18 GPIO and 2k of RAM.
Feather M0 RFM95 LoRa is a portable, lightweight 900 MHz development board with an on-board SAMD21 processor and a LoRa radio.
Seeeduino Lotus - ATMega328 Board with Grove Interface combines both the features of the Seeeduino and the Base shield using an ATMEGA micro-controller.
SparkFun MicroView - OLED Arduino Module is a display unit compatible for your Arduino,which reflects essential data from your Arduino board.
Blend - BLE+Arduino is a combination of Arduino as well as BLE
FLORA - Wearable electronic platform: Arduino-compatible suited for your e-textile projects
Lilypad Arduino 328 is a microcontroller board thats runs on the ATmega 328