combo tool

http://www.eventhubs.com/news/2014/jan/05/combo-trainer-super-street-fighter-4-arcade-edition-v2012-helps-you-learn-timing-and-which-setups-are-possible/

http://www.reddit.com/r/SF4/comments/1uhg11/i_wrote_a_program_that_may_help_you_with_combo/