Many times we talk about the other levels, D2, D3, Juco, and NAIA. There are others levels as well, including Club, NCCAA, and USCAA.
Club
USCAA
http://www.theuscaa.com/sports/bsb/index
Some NCCAA schools are also NCAA schools but many are not.
http://www.thenccaa.org/index.aspx?path=baseball