Wörterbücher

=Wörterbücher=

Collins Reverso - German-English - Meanings by frequency in the language. Most suited for beginners.

Leo.org - German - Englisch: Comprehensive. Meanings listed alphabetically, not by frequency. Notes for technical terms.

Biolingus - From the Universität Chemnitz. Includes proverbs and sayings.

=Conjugations of Verbs and Declination of Nouns=

Canoo.net Be sure to select "Wortformen" in the menu. It will conjugate verbs and show the cases and plurals of nouns.

Verbix: Conjugate verbs.

Reverso: Verb Conjugation

=German Thesauri=

Openthesaurus.de

VERY COOL! A visual thesaurus: VisuelleSynonome.com: Click on image. There is also an English version if you need it!