Invision - Prototyping and collaboration for design teams
Fluid UI - Fluid UI helps you prototype Android, iPhone, iPad or Windows 8 mobile apps with our custom libraries, or upload your own images for pixel perfect mobile
Atomic - The fastest way to design beautiful interactions
Pixelapse - Visual version control and collaboration workflow for open source and private design projects.
STUDIO - Next generation design tools for digital products.
pttrns - iPhone and iPad user interface patterns