Hey folks! I've been working on a language for quickly sketching out app ideas/user flows, inspired by the concept of a "software breadboard" from Basecamp's Shape Up methodology (https://basecamp.com/shapeup/1.3-chapter-04#breadboarding): it's definitely not ready for prime time yet, but I think it's got the bones of a decently expressive rapid prototyping language. Feel free to play around with the demo at https://breadboard.redefine.software. Source code is on GitHub: http://github.com/redefinesoftware/breadboarder. Curious to hear your feedback!

This is really nice – also I love DSL->diagram in general