Wiktionary

Wiktionary is a multilingual, web-based project to create a free content dictionary, available in 158 languages.

Free Open Source Android Web

Tatoeba

At its core, Tatoeba is a large database of example sentences translated into several languages. Search example sentences translated into many languages. Add and translate your own sentences.

Free Open Source Web

Linguee

Linguee is a new kind of dictionary app for French-English, Spanish-English and other language pairs. You will find reliable translations in the shortest time, even when you're offline.

Free Android iPhone iPad Web Apple Watch

Lion (LEO dictionary)

Lion allows you to send a query to the German-English, -French, -Spanish and -Italian LEO dictionaries (Chinese is currently not supported) with a click of your mouse from almost all MS Windows applications.

Free Personal Windows Android iPhone Blackberry Windows Phone HP webOS S60