Imageepoch worked with Type-Moon to create Fate/Extra, which Marvelous published. They have another Type-Moon collaboration.
Ark Project is an original simulation RPG. The teaser name is interesting since Imageepoch has two "Arc" series Arc Rise Fantasia and Luminous Arc. Both of those intellectual properties belong to Marvelous, though.
Mars Project is a game with a famous JRPG creator.
Remus Project takes a classic series and changes it into a JRPG.