Microduino: Arduino in your pocket, small, stackable, smart by Microduino Studio. A small sized board that packs a great punch!
The Microduino series is a 100% Arduino compatible open source hardware, compatible with Arduino IDE development environment and existing Arduino sketches. Microduino is small. Its size is about a quarter (25.40mm X 27.94mm / 1.0inch X 1.1inch), much smaller than the original Arduino board. BLEduino: Bluetooth 4.0 Made Easy. RFduino - Home. CC3000 WiFi Breakout with Onboard Ceramic Antenna ID: 1469 - $34.95. For years we've seen all sorts of microcontroller-friendly WiFi modules but none of them were really Adafruit-worthy.
Either they were too slow, or too difficult to use, or required signing an NDA, or had limited functionality, or too expensive, or too large. So we shied away from carrying any general purpose microcontroller-friendly WiFi boards. The CC3000 hits that sweet spot of usability, price and capability.