Undesign - Free design tools and resources for your projects
Atomic - The fastest way to design beautiful interactions
App Icon Template - Royalty free app icon creator for iOS, OS X and Android
Lean Service Creation - Open source design process and toolkit
UX Tools - Compare UX design tools side-by-side
FeaturePeek - Collaborate on in-progress website implementations. FeaturePeek allows your team to collect feedback on your front-end during the implementation phase of development.