Arabic Wordlist aims at building an Open Source (GPL) wordlist to be used in public dictionaries for both online and local use. This dictionary's main focus is to present a means to translate a very broad range of English terms to Arabic.
Diqt is a multilingual dictionary reference tool. That is, dictionaries of many languages can be searched using a web browser.
dMof is a program for word-by-word translation (glossing) of texts between languages. Currently there is a web interface for glossing passages in Tolkien's Elvish (specifically, Quenya) into English.
freli is an ongoing project to provide simple lexical information for as many English words as possible. Each entry contains the word's part of speech, a rough indicator of its frequency, and other information.
Glossword is a dictionary management system. It features multiple language support, themes, a powerful administration interface, built-in search and cache engines, export/import dictionaries in XML format, W3C-validated code.
Open Translation Engine
Open Translation Engine is a group of web-based translation tools. Currently supports Dutch/English and English/Italian. Written in PHP with XML Dictionaries.
sdcv is a simple text-base utility to work with dictionaries in Stardict's format.
tw and gtw
tw (short for "Translate word") is a script that translates words in different languages. It uses internal dictionaries, the Google translation service, and free translation capabilities to translate a word. gtw (short for "Graphical Translate Word") is a graphical front end for tw.