Transferslot - Easily buy and sell side-projects
A.I. Experiments by Google - Explore machine learning by playing w/ pics, music, and more
SaaSPlace - Acquire, invest & sell SaaS products, plugins and apps
BundlePhobia - Find the performance impact of adding a npm package to your bundle.
Flippa - Flippa is a platform for trading websites.
JavaScript.com - A free resource for learning and developing in JavaScript