sim900-library
There are 3 repositories under sim900-library topic.
nthnn/SIM900
A much more comprehensive library for Arduino SIM900 shield.
rusakovichma/SIM900D-sample
SMS guard firmware based on sim900d and AVR atmega32
AiltonFidelix/SIM900-HTTP
Simple SIM900 HTTP POST and GET by serial port. Used for test SIM900 module.