Fileographer is designed to let you do almost everything with the keyboard, not the mouse. It lets you navigate your hard drive by typing a few letters from the name of the file or folder you want to see.

MailToDoList is a Chrome extension that lets you manage your Gmail inbox the way you manage a to-do list. It lets you move individual emails up and down. It lets you group and hide related emails. And it lets you add tasks and notes to emails.