MIT-licensed cross-platform HTML5+AngularJS mobile app development framework (docs use Apache 2.0 license). The developer offers commercial packages that provide cloud services.
W3C Semantic Web group's webapp implementation of pyRDFa: parse RDFa from a URL, uploaded file, or text area; get bookmarklets to parse RDFa directly from the current page.
MIT-licensed HTML5 template and CSS framework built for responsive design based on a 12-column grid. The boilerplate contains no JavaScript, just HTML, CSS and example site icons (favicon & iOS).
A MIT-licensed template for HTML5 websites that includes a lot of CSS and JS tweaks and optimizations. It provides support for JQuery, Google Analytics, old browsers, etc.