From your previous thread, it seems like you may not be looking for the typical post-high school seminary. If you are looking for a night/post-seminary age program, there is Ohr Naava, Nitzutz, and one more whose name I don’t remember in Brooklyn, and Sheefa in the Five Towns. Ohr Naava offers shiurim year-round; I don’t know if the others close for the summer or not. There are also plenty of shiurim offered outside of formal programs.