Ding is a dictionary lookup program for the X Window system on Linux/Unix. It comes with a German-English Dictionary with about 253,000 entries. It is based on Tk version >= 8.3 and uses the agrep or egrep tools for searching. In addition ding can also search in English dictionaries using dict(1) and check spelling using ispell(1). It has many configuration options, such as search preferences, interface language (English or German), and colors. It has history and help functions and comes with useful key and mouse bindings for quick and easy lookups.
TAO Translator (formerly, The Advanced Online Translator) uses online translation services to provide translations. Currently supported services: Google Translate (supports translation, language detection, dictionary, and reverse translations for single words); Microsoft Translator, a.k.a. Bing Translator (supports translation only); Yandex.Translate (supports translation and language detection); and Yandex.Dictionaries (supports dictionary with synonyms and reverse translations). More services are possible in the future.
MAPDAV (More Accurate Password Dictionary Attack Vector) is designed to use what is known about users via the /etc/passwd file on Unix/Linux systems to generate a dynamic dictionary of more accurate guesses as to what their possible password may be. It does this by mangling the user's username and user information in various user-specified ways to look for bad password protection practices.
Artha is a handy thesaurus based on WordNet with distinct features like global hot key look up, passive desktop notification, regular expression based search, etc. Artha may be used as a free open-source replacement/clone to the proprietary WordWeb Pro thesaurus (which is also based on WordNet) on Unix-like and Windows operating systems.
JWKTL (Java-based Wiktionary Library) is an application programming interface for the free multilingual online dictionary Wiktionary. Wiktionary is collaboratively constructed by volunteers and continually growing. JWKTL enables efficient and structured access to the information encoded in the English, German, and Russian Wiktionary language editions, including sense definitions, part of speech tags, etymology, example sentences, translations, semantic relations, and many other lexical information types.
QuickDic parses data from en.wiktionary.org and Beolingus to generate dictionary files that can be used offline. It currently has built-in dictionaries from English to: German (Deutsch - Englisch), Italian (inglese - italiano), Afrikaans, Albanian, Arabic, Armenian, Belarusian, Bengali, Bosnian, Bulgarian, Catalan, Croatian, Czech, Chinese|Mandarin|Cantonese, Danish, Dutch, Esperanto, Estonian, Finnish, French, Greek, Hawaiian, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Irish, Latin, Latvian, Lithuanian, Japanese, Korean, Kurdish, Malay, Maori, Mongolian, Nepali, Norwegian, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Sanskrit, Serbian, Slovak, Somali, Spanish, Swahili, Swedish, Tajik, Thai, Tibetan, Turkish, Ukrainian, Vietnamese, Welsh, Yiddish, and Zulu.
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.
Dictconv-cx is a dictionary converter that is a stripped down and expanded version of dictconv. It removes support for the DICT dictionary, stardict, as other tools such as makedict handle it well, and adds support for UTF-8 encoding, keywords longer than 255 characters, 82,000+ character length in definitions, and other changes.