HogTrans provides an automatic word translation engine built on statistics of text translations used for free software. It basically provides an automatically created dictionary with multiple translations and example usages for each. HogTrans can import translations from standard GNU .mo-files.
new-words is a script that helps you to control your vocabulary and find unknown words in texts before you start to read them. It is intended to be run in a console; the interactive part of the work is done by means of a text editor (vim by default). It features: words frequency information about words in a text; users vocabulary control; support for several languages; dictionary software integration; and the ability to make notes for unknown words.
sdvplayer is a tool to help you improve your vocabulary in a foreign language by watching movies with subtitles in that language. It allows you to look up the meaning of a word displayed in the subtitles just by clicking on it. The meaning will be printed right on the screen and the player will be paused. Playing can be resumed just by pressing the space bar. It can play movies in many of the formats supported by libav*. Subrip (.srt), microDVD, and subviewer subtitle formats are supported. The meaning can be looked up through an external command. The built-in dictionary parser can parse the stardict dictionary format.