Renaixenca Translator - Autodetects language of one or several phrases and translates them to one of more than 50 possible languages. Uses Google Language Detection and Translator API. Note: Languages with special characters are only supported if your Android device has the fonts installed. New version includes more languages like Swahili, Welsh, Yiddish, Malay, ..
Duolingo - is a popular application, which will help you improve you knowledge of a foreign language in practice. You can improve reading, speaking, writing and listening skills. There are many languages available to learn, among which the most popular: English, French and German. You will learn in the form of game, this is much funnier and more efficient
Renaixenca Translator - small Any to Any Translator Application.
Autodetects language of one or several phrases and translates them to one of more than 50 possible languages.
Uses Google Language Detection and Translator API
MyTranslator for Android is a talking translator. It's a mobile phone application for language translation. Use your Android phone to translate to and from English, French, Spanish, Malay, Japanese, Chinese etc.
You also have the option for the app to read out the translated text for you. However, not all languages can do the talking depending on availability
Microsoft translator - is a translation application which can translate text as well as voice messages recorded with the help of a microphone. It offers translation into 50 languages with transcription and correct pronunciation. A user can also use a smart clock
Multi Phrasebook - Very easy to use multi-lingual phrasebook containing basic phrases for use when traveling. Every phrase for each language contains sound. Languages: English, French, German, Russian, Spanish
Modict Free - Multi-languages dictionary for Android. Supports Stardict, Kdict, Zdict free dictionaries. Words can be added into History and Wordbook. Define custom online-dict to query free web protocol, and online-dict can be exported and imported. Supports Recite (random, word fill game...) and Quickbar, you can search anywhere outside of application
SeaThreePO utilizes Google's GTalk translation bots to provide a simple translation service. As the author says "Its translations aren't great, but would probably do in a pinch. They'll likely improve as Google improves its translation bots".
More about the SeaThreePO project you will find at: http://code.google