Placemat - Pretty nice placeholder images.
AudioBus - With Audiobus, the revolutionary new inter-app audio routing system, you can connect your...
PlaceKitten - Dead-easy placeholder images. Of kittens.
TrueFire - The Best Guitar Lessons Online Fast. Easy. Fun.
placeholder.pics - Lightest way to include placeholder images in your design
Go Button - Go Button is a mobile audio app designed to provide professional playback of music and sound effects for live shows. It provides a creative, self-contained show control system that runs on your iPad, iPhone, or iPod touch.