I've played some of the free Lumosity brain training games. Now they are accepting applications for teachers to get licenses for their class. There are more details and the research behind the move on the Lumosity blog http://www.lumosity.com/blog/were-helping-students-leap-ahead/
I've actually read through the entire application now. There are some components that are not feasible for my district based on policy. So, it might not be a match for your school, but it is still worth checking out.
Funny (fictional) Tweets by historical figures - summery of the person's contributions in 140 characters. Some of the Tweets are not kid friendly, so read in advance. Check ReadWriteThink to find the lesson plan for students to write their own historical text messages.
Not a new tool - but a refresher of the resources and content on the website. Provides educators/students resources including lesson plans and examples of student work. Many of the examples are for reading/language arts, but can easily be adopted for other subject areas (all grade levels).