The entire ohmage platform is open source, so we'd love to have your help extending the project to better fit your purposes! Beyond just extending the core platform, ohmage also has a clearly defined set of APIs that you can use to develop your own frontend visualization tools! Take a look at the existing projects below, our API doc sheet (or just head straight to our github organization) and take a look at some code! Do check out our self-host options so you have a server to develop against! Our vagrant install will leave you with a full-fledged development environment in minutes!
JavaEE-based web application which offers the ohmage 2.x API platform
Native android apk library for ohmage 2.x. Written in java
The classic ohmage 2.x frontend written with Google Web Toolkit. Provides the ability for users to view history of responses as well as lists of classes and campaigns to which they belong.