Leena Liimatainen found Reactored:

• Significantly improves attainment“A reluctant class worked on a high percentage on an assignment they would have otherwise overlooked, and gained better results in a test.”
• Moderately builds student knowledge“Some quiet students get to show their knowledge and grit, some rowdy students end up doing good work.”
• Slightly reduces teacher workload“At this point, getting everyone on board is still a bit of a struggle, as the interface could be more intuitive. Preparing assignments takes either a lot of teacher's time or sacrifices class time, if you make students make their assignments themselves - although this latter can be quite effective. On a very much more positive note, you gain great level of scaffolding and Reactored works wonders for differentiation both for those who are unmotivated and struggle, and those whose learn is on the fast lane. Grading papers is such a breeze there should be a tax on that :)”
• Slightly saves school money“It's not the cheapest tool around, but you do get a lot for your money's worth. At this point, however, creating content is still a lot on the teacher. I'd love to see this tool coupled up with a publisher.”