Redbeard makes it faster and easier to create native apps without a boilerplate. It's a complete framework with tons of components.
Bootstrap Tour is an easy way to add a tooltip tour to your website. It even works if you don't use Bootstrap!
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Liquid is a safe, customer-facing template language for apps. It was created by Shopify and written in Ruby.
Rocket.chat is an open source web chat platform. It's multi-platform and highly configurable.
Dio is a lightweight virtual DOM framework. It's only 6kb minified and gzipped.
APImock is a very basic fake API server. It can be used for building the front end of an app before the back end is ready.
Weex is a mobile cross-platform UI framework. It's lightweight, high-performance, and extendable.