There is so much at dic.academic.ru – monolingual and bilingual dictionaries, technical dictionaries, encyclopedias, etymological dictionaries, lots more – that I rarely go anywhere else to look something up or even stop to think about what they have. I just type something in the main search box and see the results from lots of sources. This is easy and usually works, but I miss some things: I only now realized that feb-web has a dictionary of eighteenth-century Russian, from the beginning of the alphabet up to Непоцелование. There is something with the same title at dic.academic.ru, but even though it claims to be a language dictionary, it seems to be a biographical encylopedia of people who lived in the 1700s. There are several other reference books for literature at feb-web, too.