BuiltWith Toolbar - Reveals the tech underneath a website. Browser extension.
Checklist Design - The best UI and UX practices for production ready design.
Spokk - Get your creations or ideas for blogs, designs, art, music, photos, YouTube videos or anything...
UX Design Weekly - The best user experience links each week to your inbox
Resource Center by UserGuiding - All your product, marketing and help materials in one place
moyo - Make your UX qualitative testing easier with moyo