Mapnificent is a framework for overlaying an HTML5 canvas element on Google Maps to visualize geographical information.
The current main use case for this framework are Mapnificent Berlin Rush Hour and Mapnificent London Night Buses. These visualizations of public transport travel time were inspired by Mapumental.
The framework and layers are released under Creative Commons by-nc-sa.
A documentation about how to write layers for Mapnificent is available at docs/index.html
A blog article how mapnificent was created and how it compares to mapumental
Slides of a talk given at JS User Group Berlin
Mapnificent currently uses jQuery/jQuery UI and only works with Google Maps. Looking forward to an OSM fork.