Magic Piano is the best Multitouch Piano for android. It is equipped with 6 Full Octaves, recording and music playing features, beautiful animations, piano skins and tons of other features

OffiDocs is the best Office viewer for excel, powerpoint and word files that runs on Android. OffiDocs allows you to read any kind of documents and files: LibreOffice, Open Office, MS Word, PowerPoint, PDF, plain text and Excel documents.