We browsed the world wide web for you and picked a few of the best  language-related links. Of course, this is a highly biased list, so we invite to take a look at our suggestions ... and add your own:

Helpful dictionaries:

BCS dictionaries:

Rečnik Internet Krstarice
http://www.krstarica.com/recnik/

Hrvatski jezični portal

http://hjp.novi-liber.hr/

Multilingual dictionaries

EUdict
http://www.eudict.com/

Engleski jednojezični rječnici

Dictionary.reference with Resource Center
http://dictionary.reference.com

Merriam Webster Online - rječnik i tezaurus
http://www.merriam-webster.com

Oxford Dictionary

http://www.oxforddictionaries.com/

Collection of dictionaries

If the previous links didn't turn out to be helpful, try using this little application:  Lexicool - Directory of bilingual & multilingual dictionaries.