WeMos / LoLin
WeMos is a company that develops low cost-effective Internet of Things (IoT) devices for various projects and products. WeMos D1 Mini series are one of the products developed by the company to enable wireless connectivity, simple data traffic and electronic controlling to electronic projects at the same time. Very small-sized and its footprint is breadboard friendly. Arduino IDE compatible, you can use the same Arduino IDE to program this board (add-on extension required and available via Board Manager).