Hi Trevor
Have you seen this one: http://melbourne-cshe.unimelb.edu.au/research/edutech/completing-the-loop
It was only published this week through a government grant and though it is not a plugin there is a tool that can be downloaded from the Git-hub and installed on a server.
There is an associated report with the project: http://melbourne-cshe.unimelb.edu.au/__data/assets/pdf_file/0006/2083938/Loop_Handbook.pdf
Overall it looks quite good and is open source ;)
Shaun