Wireframe.cc - Sweet and simple online wireframing tool.
Mixeek - This website is for sale! mixeek.com is your first and best source for all of the information you’re looking for. From general topics to more of what you would expect to find here, mixeek.com has it all. We hope you find what you are searching for!
WireframeSketcher - WireframeSketcher is a wireframing tool for creating wireframes, mockups and prototypes for desktop, web and mobile apps. It's a desktop app for Mac, Windows and Linux, and a plug-in for any Eclipse IDE.
Sencha Animator - I just learned about the halt to production and development of Sencha Animator.
Saola Animate - Easily create engaging HTML5 animations and interactive web content without coding skills
GSAP - GSAP (GreenSock Animation Platform) is a suite of JavaScript tools for high-performance animations that work in all major browsers.