Android developer portal with tools, libraries, and apps

Amaze UI is a modular mobile-first front-end framework.

An open source HTML/CSS framework for prototyping native phone/tablet applications.

Web framework for smartphones & high-end devices.

jQuery Mobile is a HTML5-based user interface system designed to make responsive web sites and apps that are accessible on all smartphone, tablet and desktop devices.

Build mobile apps with simple HTML, CSS, and JS components.