I came across this while looking at the jisc frameworks page, (that will be a separate post). Mantis is a server at York hosting maths/assessment type projects in Moodle
“The Mantis server hosts the web sites of several open-source projects related to e-learning. The sites are realized as courses within the Virtual Learning Environment Moodle. This makes sense because all these projects develop tools that can be used from within Moodle so these tools can be demonstrated on this site. All project sites are open to guests but you are also invited to create an account for yourself and contribute to the discussions in the forums.”