What are some alternatives?
When comparing Google Translate and Dictionary.com, you can also consider the following products
Microsoft Translator - Microsoft Translator is your door to a wider world.
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more
Lingoes - Lingoes is an easy and intuitive dictionary and text translation software.
Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese
Wiktionary - Open Source wiki-dictionary by the Wikimedia foundation