GitHub repository: stlhrt/TinyGSM
Primary language: C++
Description: A small Arduino library for GSM modules, that just works. Supported modules: SIMCom SIM800, SIM900, A6, A7, M590, ESP8266-AT (plus variants like A6C, SIM800A, SIM800C, SIM800L, SIM800H, SIM808, SIM868, SIM900A, SIM900D, SIM908, SIM968)