CEGUI is really nice in terms of the flexibility and design, but the API is terrible. BUT, don't let that stop you from using it. Spend a day writing a wrappe

CEGUI is really nice in terms of the flexibility and design, but the API is terrible. BUT, don't let that stop you from using it. Spend a day writing a wrapper around the API to CEGUI or whatever bindings you're using (e.g. the Python bindings) and you'll absolutely love it.