Souleiman recommends PENULTIMATE- "It's made by Evernote, and it syncs with your Evernote account. It also recognizes handwriting and indexes it. Most importantly it's free so it won't hurt to deploy it - maybe some kids might like it."
Dan recommends NOVA ELEMENTS- "The jist of it it is that it is an interactive periodic table of elements. One can build molecular compounds and atoms with the molecular sandbox function. You can also watch videos about certain molecules and elements. You can also build atoms and substances as part of a game."