Q:

Links to useful resources to be kept and placed to FAQ

I suggest we start collecting the links to the worthy resources that can help in developing the community and answering the questions.
The format I propose is: a link (URL) + a sentence about it
Let me start off with my list:

http://poiskslov.com/
finding a word by known letters
Этимологический словарь русского языка
http://ewiki.info/index.php
plenty of all sorts of dictionaries

A:

http://gramota.ru/ leading grammar reference website
http://dic.academic.ru/ multi-dictionary search
http://translit.cc/ translit converter

