Can anyone explain to me in layman terms, how this is legal? I mean charging money for freely available open source tools, not owned by this site?
In case of copyleft licenses, the only thing not allowed is preventing your buyers from exercising the same freedom you had. That is, they are allowed to redistribute without cost, and they too are allowed to sell.
That being said, I'm finding myself reactive viscerally to this site and what feels like an abuse of friendly licenses.