SSBB
http://www.smashbros.com/

SSBM (japan)
http://www.nintendo.co.jp/ngc/galj/index.html

SSB (japan)
http://www.nintendo.co.jp/n01/n64/software/nus_p_nalj/index.html

Super Smash Flash 2
http://ssfdojo.mcleodgaming.com/