Since the creator’s site is unavailable and has been for some time, I’m hosting a mirror of a binary of the handy HexUploader. It was available through a third party. This is a small Mac app that allows uploading .hex files to a ATMega chip implementing the STK500 bootloader, e.g. Arduino’s. I used it to flash GRBL.
Like this? You might be interested in my latest project. It's a desk light made completely from a single sheet of printed circuit board. Check it out:
