Milligram is a minimalist CSS framework. It’s lightweight (only 2kb gzipped!), and is designed for better performance and productivity.
Homepage: http://milligram.github.io/index.html
GitHub: https://github.com/milligram/milligram
Docs: http://milligram.github.io/index.html#popover-grid
Fabricator lets you build your own custom UI kit. Organize your system however you want, and even generate a style guide from your toolkit code.
Homepage: http://fbrctr.github.io/
GitHub: https://github.com/fbrctr/fabricator
Docs: http://fbrctr.github.io/docs
Demo Page: http://fbrctr.github.io/demo
PHAP allows you to write native mobile apps using PHP. It uses PHP for the functionality, and HTML/CSS for the UI, making it easy to create apps that run natively on iOS, Android, and Windows Phone.
Homepage: http://phap.landingpage.io/
Axure RP gives you the wireframing, prototyping and documentation tools needed to make informed design choices, persuade any skeptics, and document your design… and maybe win a few fans along the way. Choose the Standard edition for prototyping or go Pro to add documentation and collaboration features.
Appolo makes it easy for developers to create portfolios of their apps. It’s a set of plugins and themes for Jekyll, and is fully responsive.
Homepage: http://www.delightfuldev.com/appolo
GitHub: https://github.com/nicnocquee/appolo
Imba is a new programming language for building powerful web applications. It includes language level support for defining, extending, subclassing, instantiating, and rendering dom nodes.
Homepage: http://imba.io/home
GitHub: https://github.com/somebee/imba
Docs: http://imba.io/guides
Twitter: http://twitter.com/imbajs