[junke]

Céu looks really similar to Esterel. The thesis (http://www.ceu-lang.org/chico/ceu_phd.pdf) has a section titled "III.7 Differences to Esterel". (edit: removed explanations, the other comment is more detailed).

[fsantanna]

Thanks, forgot to mention in the other comment that Céu is actually based on Esterel.