Xeno is a series of RPG games directed by Tetsuya Takahashi. The first game in the series (Xenogears) was published and is owned by Square Enix; later entries were published by other companies.
Xenogears (Feburary 11th 1998). PlayStation.
Xenosaga Episode I: Der Wille zur Macht (February 28th 2002). PlayStation 2. Developed by Monolith Soft, a company co-founded by Takahashi with help from Namco, who ia the trilogy's publisher and owner.
Xenosaga Freaks (April 28th, 2004). PlayStation 2. A compilation of mini-games, including a text adventure, a word puzzle game and a demo of Episode II.
Xenosaga Episode II: Jenseits von Gut und Böse (June 24th 2004). PlayStation 2.
Xenosaga Pied Piper (July 14th, 2004). Mobile Phones. A prequel to Episode I.
Xenosaga I & II (March 6th, 2006). Nintendo DS. A combined remake of the first two Xenosaga games.
Xenosaga Episode III: Also sprach Zarathustra (July 6th 2006). PlayStation 2.
Xenoblade Chronicles (June 10th 2010). Wii and Nintendo 3DS. Owned and published by Nintendo after the adquisition of Monolith Soft.
Xenoblade Chronicles X (Early 2015). Wii U.
Xenoblade Chronicles 2 (TBA). Nintendo Switch.
Manga & Anime
Xenosaga: The Animation (January 5, 2005). Anime adaptation of Episode I.
Xenosaga (2004). Manga adaptation by Atsushi Baba.