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I had the same thought. Now I remember that most of the best software for developers is already open source.

Simply not true on Windows. Hardly true on OS X, but otherwise, yes, gcc is free.

Reading this list makes me happy I develop for/with Linux.

Eh, the fact that there are a lot of paid software for Mac is not indication of the lack of open source software. It only suggests a healthy market.

There a lot of open source software for Mac, too, and I frankly does not use any software on this list. In fact, the POSIX nature of Mac OS X means that the majority of open source software on Linux are also available for OS X.

I never understand this mindset, where OS X having a thriving independent software ecosystem -- something that I would expect HN to support, startups doing well and all that -- is a negative.

People just want to make (even more) money.

The only software I pay for is my IDE :).

Indeed. They should call it "Mac Friday" deals. Sqlite manager pro? Really? Someone would pay for that?

Several of the services here are pretty interesting (Slack, DigitalOcean, Algolia (they run HN's search)):

http://www.producthunt.com/e/black-friday-startup-toolkit