Squeak has the nicest, most intuitive GUI system. The language and the system is designed to be accessible to youngsters, yet it's more than powerful enough for

Squeak has the nicest, most intuitive GUI system. The language and the system is designed to be accessible to youngsters, yet it's more than powerful enough for Trevor Blackwell to recommend it. I'll quote him on good code bases that I know of include: "Squeak, which is written in itself. It includes the complete source to its powerful GUI system, and is the only GUI toolkit I know of that is clean, readable, and hackable."