UI Garage - Specific mobile and web design patterns for your inspiration
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Muzli - UI/UX and Design Inspiration Chrome Extension
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Design Hunt - Curated design inspiration for everyone
X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.