I enjoy the philosophy behind Esperanto -- a fully regular, easy-to-learn second language for everyone. It's often poo-poo'ed as not being "international enough" due to Zamenhof's inspiration and vocabulary coming primarily from European languages. It's also dismissed as having missed its window since its decline following France's refusal to allow it to supplant French as the official language of the League of Nations in the 1920s.
Is there an Internaional Auxiliary Language in the works that might have a shot at succeeding where Esperanto has not?