My current list:

* Armin Ronacher: Flask, Jinja2, click

* Jonathan Blow: game dev, designing a new low-level language called Jai (https://www.youtube.com/user/jblow888)

* Michael Fogleman: extremely proficient Go developer; wrote a Minecraft clone in both Python and C, and a NES emulator in Go (https://github.com/fogleman)