This site lists hundreds of dictionaries and translators for many of the world's languages. Dictionaries and translators are listed by group; the groups are listed in a menu at the top of the page. NOTE: Many online translator services have difficulties translating slang, idioms, and colloquialisms.
This Web site lists links to dictionaries for foreign languages and glossaries for dozens of different fields, including forestry, space, religion, the European Union, and more.
This online dictionary also has links to foreign language resources, a built-in translator, information about language histories and development, and a discussion board for linguists and logophiles (word lovers).