How to search free apps for android?

Question

Android

There is no way to sort the results in the play market, many applications that are positioned as free require the purchase of a pro version. In an attempt to find something, I only got to garbage sites, and it became interesting to me, is there really no free open source applications for android? Or rather, how to find them?

Answer 1

Alternativeto.net has filtering by platform and purchase option.