I released the choosel mashup framework under the Apache 2.0 license on Google Code. It is a research prototype platform that is used in our Bio-Mixer tool, which is developed at the CHISEL group.
Choosel supports the creation of web-based information mashup environments. These mashup environments facilitate the flexible recombination of information in different views such as maps, timelines and graph viewers. Users without any programming expertise can remix information using drag and drop interaction and explore data sets. The workspaces (mashups) can be stored and shared among users.
We are looking for contributors. If you are interested, please post on the choosel mailing list.