As a programmer, I am extremely impressed by Fabrice Bellard and Justine Tunney.
l33tbro
I love what Grant Petty and his team at Blackmagic Design are doing. Creating cutting-edge, feature-rich, 10k cinema cameras at a fraction of the price of the industry giants.
heresjohnny
Pieter Levels (levels.io) is an amazing inspiration for any indie dev.
tobinfekkes
I admire anything Mike Jolley writes at Automattic.