Yes! I love this tool, and it's open source too! Only took me ~15 minutes to create the main diagram in the article and it came out looking great.

Watermark is optional, but I kept it because I appreciate someone took the time to make a high quality diagram tool and still open sourced it.

Ooo! Thank you for pointing it out. I've always wondered what tool bloggers used to make their neat diagrams. I feel like doing some graph theory stuff now for kicks, or just general illustrations.