"Both of these apps can be used by students without creating any kind of new online accounts. Neither one is entirely perfect, but they're both quite good." - Opinion is an iPad app & recordings can be saved to Soundcloud & Evernote. StoryCorps is available for iPhone and Android devices, and is good for interviews.
"Math Time Attack! has Flashcards, Quiz and Test modes to help learn and recall multiplication, division, addition and subtraction with an emphasis on speed and accuracy."