I'm in grad school (I feel like I have to keep saying this to explain my lack of time) and I was a Japanese studies major in undergrad. For the last couple of months, I have been upset that I never have time to manage self study Japanese. It seems as if the time just goes by! And until next summer (when I can go back to my hometown to study at a language institute) I will be stuck with little time.

I still know quite a bit and really still enjoy learning it. So are there apps, websites, audio, audio books and any other materials that can help me retain what I know or continue learning? And are there apps you manage your time?

Also, I would like to learn other languages as well, so if there are good apps out there (even the paid ones) please let me know.