Navita is a free five language translator for your Blackberry. Its similar to bbtrans also made with a very simple interface. I don't know what translation engine they are using but it seems to be okay and fast enough. My officemate claims the German translation works well and is usable
Blackberry Language Translator is an easy-to-use on-line multi-translation application that helps users to translate words, phrases and does a dictionary lookup. BBTran supports more than 40 languages (Arabic, Chinese, Dutch, English, French, German, Greek, Italian, Japanese, Korean, Portuguese, Russian, Spanish etc
Dictionary.com app - The free Dictionary.com app for BlackBerry delivers trusted reference content from Dictionary.com and Thesaurus.com including more than 500,000 terms, definitions, and synonyms
BCD Translator is an Translator it just converts the data from one languages to anotherthis Translator supports up to 36 languages.it is for the people who are looking for a brighter access to get the data.excellent GUI is a special attraction
FancyTran (BBTran) - FancyTran is FREE and the most popular multi-engine translator for BlackBerry®.
FancyTran is a First runner-up winner in Most Addictive social app using the BBM™ Social Platform Contest 2011.
Currently supports Google and Bing translation engines with Text to Speech pronunciation and Speech recognition
BBTran Pro - BBTran supports 59 languages (Arabic, Chinese, Dutch, English, French, German, Greek, Italian, Japanese, Korean, Portuguese, Russian, Spanish etc) and more than 1800 directions of translation
Polyglotz is a talking translator. It can translate and speak in multiple languages. It supports over 30 languages. You can use Polyglotz as a language learning tool or a communication device in a foreign country
Translator+: online multi-translation tool for BlackBerry - Translator+ is a powerful online multi-translation tool that allows users to translate words and even phrases.
Translator+ supports: English, Dutch, French, German, Greek, Italian, Portuguese, Russian, Spanish, Chinese Simplfied and Chinese Traditional languages and about 30 directions of translation