Ubisoft

Ubisoft Entertainment SA is a video game company currently headquartered in Rennes, France. Founded by Christian, Claude, Gérard, Michel, and Yves Guillemot, they have developed games from acclaimed franchises, including Rayman, Assassin's Creed, Just Dance, and Prince of Persia.

Mario + Rabbids Kingdom Battle
Ubisoft have published the Mario and Rabbids crossover game Mario + Rabbids Kingdom Battle outside Japan, and the game has been developed by its Milan and Paris studios. Within Japan, it is published by Nintendo.

Other games
Trophies of Rayman, Globox, and Barbara from the Rayman series are present in Super Smash Bros. for Wii U, and costumes for the former two characters, based on Mario and Luigi respectively, can be obtained in the Wii U version of Rayman Legends and its Nintendo Switch port Rayman Legends Definitive Edition.

The Wii version of  features an exclusive track named "Just Mario" with the artist credited as "Ubisoft meets Nintendo". The song is a rearrangement of the Super Mario Bros. overworld theme and its backing video depicts Mario interacting with various elements from the game.