Ruby on Rails
Conductor

Conductor is an application under development by 37signals?. Here’s what we know, based on info from State of Rails

1. Conductor – Should make development “nicerâ€?
2. About moving Rails down
3. CocoaMySql-like interface for Rails, so you don’t have to create tables by hand
4. Scaffolding – making it more suitable for permanent use
5. Naked Objects: A gui with which you can control the domain model

See it in action at http://www.loudthinking.com/lt-files/conductor/
Looks really nice!