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
SMS Translate appends translation to SMS messages.
Auto-detects original language. User-configurable target language. Auto-translate incoming SMS or select individual messages for one-touch translation. Over 90 languages!
Please note, messages are sent (via the Internet) to Google Translate
TransMate - Translate words and phrases between more than 60 languages using TransMate for Android. For most languages, you can speak your phrases and hear the corresponding translations
TransZilla Translator is free translator which uses Google Translate.
The translator supports more than 50 languages.
Use translator for words, sentences translation.
Type text in translator and click GO