Slovari v seti = Online Dictionaries (Gramota.ru)
Comprehensive list of online Russian dictionaries (both mono- and multi-lingual, general and specialized), including dictionaries based on the Russian National Corpus.
Russische Wörterbücher im Internet (Ruhr-Universität Bochum)
Includes both monolingual and multilingual, as well as both general and specialized (eg. jargon, etymology, grammar, etc.)