While studying Chinese I was presented to a a number of lists of most commonly employed characters, which is a truly invaluable resource for beginners and teachers approaching a foreign language.
Soon after I found out such lists exist for a number of idioms (e.g. English, French), from which fascinating discussions regarding geographical and area-specific differences of vocabulary use.
However I cannot find the same (i.e. freely available online resource) for Portuguese language. Please, would anyone know here of some website containing such a database?