anki

extensible flashcard learning program
Anki is a program designed to help you remember facts (such as words and
phrases in a foreign language) as easily, quickly and efficiently as possible.
To do this, it tracks how well you remember each fact, and uses that
information to optimally schedule review times.
.
Besides text, it supports sounds, images and rendering TeX snippets in the
cards. It can synchronize card decks to a server so that you can review the
deck on other computers, a web interface or mobile devices, for which versions
of Anki are also available. Complete card decks offered by other users can be
downloaded the same way.
.
Anki is extensible with plugins which can be downloaded and installed from
the menu. While Anki can be used for studying anything, plugins are available
with special features designed to make studying Japanese and English easier:
integrated dictionary lookups, missing kanji reports, and more.