Ask HN: Good Sunday night downloads to try?

Hi all,

I like software, and sometimes I don't want to continue the usual internet free-time browsing habits: news websites, YouTube, video streaming, reading tech articles. And I really just want to "try stuff out".

New software, I guess. Anything. Could be games. Tools. Utils. GUI preferably. For Mac. Command line, ok. I'm just wondering anyone have any suggestions for some cool software to download on a Sunday night to play around with?

Thanks!