ja vise volim en.wiktionary.org... it gives cases and conjugations plus "related terms", perfective/imperfective chains etc for most if not all words ive come across.

http://recnik.biz/english http://onlinerecnik.com/recnik/srpski/engleski/

http://www.recnik.com/logindict.cgi :-)

http://recnik.krstarica.com/ http://slavicnet.com/ http://www.recnik.com/ http://www.eudict.com/ I use most of the time the first two. There are many more if you google „rečnik online srpsko engleski»

http://recnik.krstarica.com/?text=&text=zagrljaj&conversion=&src=sr&dst=en&do=1