Nimo
NIMO is the National Internet Mathematical Olympiad. Debuting in 2009,NIMO is supported by 5 well known AoPS users-specifically Dojo, AIME15, Mewto55555, dragon96, and isabella2296. Pythag011 is also a problem writer for NIMO. The official website is cyneer.com, and more info can be found on that website and the NIMO forum on AoPS. http://www.artofproblemsolving.com/Forum/index.php?f=581