ResearchMaster is a tool that you can trust to help with organization, multitasking, and research, both personal and professional. It provides a place to capture your fleeting thoughts and ideas, and it allows you to hit the ground running on projects. It was developed with professional scientific research in mind, but it's great for grocery lists and address books as well.
Anki is an intelligent, spaced-repetition flash card program designed to maximize your memory potential and minimize the time spent studying. It has special features useful when studying Japanese, but can be used to study anything. Anki makes remembering things easy. Because it is a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn. Anyone who needs to remember things in their daily life can benefit from Anki. Since it is content-agnostic and supports images, audio, videos, and scientific markup (via LaTeX), the possibilities are endless.
Review lets you use flashcards, automatic score tracking, and efficient review sessions to study and recall anything. It keeps track of how well you know each question, so it can test your weaker spots more frequently. You can add your own questions or flashcards in the form of text, mathematical symbols, images, or sounds. You can also set prerequisites to any question.
Dr. Higgins will teach you and help you teach yourself any language. It works like a quiz, asking you the translations of words and keeping score of your correctness. It includes a number of quizzes for self-study in different languages (English, Spanish, Finnish, and a bit of Japanese). It's very easy to add your own lists, thanks to a simple file format.