Postacard - Text a photo to send it as a postcard for $3.
CMake - CMake is an open-source, cross-platform family of tools designed to build, test and package software.
Felt for iPhone - Handwritten cards for the modern world
SCons - SCons is an Open Source software construction tool—that is, a next-generation build tool.
NanaGram - Text your photos and we'll mail 4x6 prints to your Nana.
Ninja Build - Ninja is a small build system with a focus on speed.