Thousand Arms is by Red Company. The Summon Night series is by Flight-Plan.
Atlus games would be the Shin Megami Tensei series, the Persona series, the Digital Devil Saga series, the Devil Summoner series, the Growlanser series, the Trauma Center series, Princess Crown, Prikura Daisakusen, Maken X, Kartia: The Word of Fate, the Power Instinct series, and various other obscure titles.
Atlus may publish a lot of strategy games, but the only one they developed is Growlanser - which, by the way, is one of the best titles on the PS2 (Growlanser Generations).
Too bad you dislike strategy RPGs. The only RPG I've played this gen that was worth even a fraction of my time was Valkyria Chronicles. Everything else has been nothing but mindlessly bashing the attack button over and over again, maybe throwing a potion every once in a while.