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GitHub - nerdinand/SMSGateway: A very hacky Android SMS gateway app. Enables you to connect via telnet via USB (after forwarding a port with adb) and send and receive SMS via the phone.
Simple Raspberry Pi powered SMS Gateway
BLIIoT-Modbus Gateway S175
Raspberry Pi SMS to email gateway – Part 1 – AndyPi
Wireless SMS Send Device USB 4G Ite Modem 32 Port SMS Gateway For Bulk Send SMS Modem - AliExpress
Build Your Own SMS Gateway Using Raspberry Pi
VNS4400 - Wireless SMS Gateway for instant alerts & notifications