https://www.tubabel.com/ https://www.tubabel.com/ for Spanish and https://vukajlija.com/recnik/definicije/indeks https://vukajlija.com/recnik/definicije/indeks

https://www.tubabel.com/ https://www.tubabel.com/ for Spanish and https://vukajlija.com/recnik/definicije/indeks https://vukajlija.com/recnik/definicije/indeks for Serbo-Croatian. Not alternatives, more like equivalents