Here are other tools that I found during my research.
PB Works EDU Hub is similar to Google Docs, while it allows teachers and students across the world to collaborate on similar content focus. This tool improves teaching for teachers, students, and parents. All parties have access to docs. wiki's and projects.
Coggle- Creative notetaking
Gliffy- collaborate on flowcharts, diagrams, and more!
CamScanner- One of my personal favorites! Stuck in traffic and your job needs pdf of your drivers license, CamScanner is the best tool! This tool takes ordinary pictures of important documents and can transform them into pdf if needed. Self assisted to assure your picture is in the right spot when capturing your document. Highlights and enhances your document and can be saved within the app and email within the app as well.
Sketchup is a great new tool that allows your 2D visions come to life with 3D images. If you are into taking drawing to the next level for students, this will be a great tool!