Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
AudioTools.in - AudioTools.in is software containing a top-class suite of professional-grade audio or acoustic analysis solutions and offers additional modules like smart tools, SPL graphs, and impulse response at any time.
Ozeki NG SMS Gateway - Ozeki NG SMS Gateway is a powerful, reliable and flexible SMS Gateway application.
GoAudio.me - GoAudio.me is a professional musical production company containing sound libraries that aids the producers in the creation of commercial tunes for movies or albums.
Kannel - Open Source WAP and SMS Gateway
FreshSound.ru - FreshSound.ru is a user-friendly platform that allows you to create and store complete multi-track music projects on your Android phone or tablet device.