I only knew of Untappd, but haven't used it extensively, just for casual search. Looks to be a considerable contestant in the beer database space. Here's Berliner Berg in it: https://untappd.com/BerlinerBergBrauerei

There are tons of microbreweries missing, some of which can be pretty popular (in Belgium at least). I'll be adding a few to the openbeerdb when possible.

Eschenbräu, Vagabund, Brlo, Rollberg and Lemke are also missing, but Kindl is there twice (both times with the wrong address).

Not sure how that data set was sourced.

It's missing 90% of the breweries in my city and some of them aren't that small either.