Do you use nvALT or Marked.app for writing? How about Markdown tools or automatic logging for Day One? I’m betting that if you read this site that there is something that you use daily that Brett Terpstra made or contributed to.1
Brett is now an indie developer and writer. He’s accepting donations to support his work. I don’t look at it so much as a donation but rather as a self serving act that will help make more awesome available sooner rather than later.