Pyjs is a Python-to-Javascript compiler and an AJAX widget set for Web application development. It was forked from Pyjamas and was originally a port of Google's Web Toolkit to Python.
Rikulo Gap is a bridge implementation of the Apache Cordova mobile framework (a.k.a. PhoneGap) in Dart. It enables developers to access native facilities of multiple mobile platforms using the HTML, CSS, and Dart languages.