I've built a few, sometimes for fun and sometimes as tools. There was a recent submission with some good examples: https://news.ycombinator.com/item?id=4622388

I've built a few, sometimes for fun and sometimes as tools. There was a recent submission with some good examples: https://news.ycombinator.com/item?id=46223882 https://news.ycombinator.com/item?id=46223882