KineticJS is a fast, robust, HTML5 Canvas Library that is no longer maintained. The last stable version is v5.1.0, and it's pretty darn solid. You can find the github project here.
I am also no longer maintaining the CDN which hosted KineticJS files. If your site was using KineticJS hosted on Amazon's S3 CDN services, I'm very sorry for having to pull the plug, but it was getting very costly. For your convenience, you can still find all of the stable versions of KineticJS below in a tar file. Just download the version that you need, untar it, and add it to your website servers or CDN.