Winamp - only the properly modified EXE
TAK Input - the only reason why you would like to use winamp instead of foobar
TAK Input Mirror
Kernel Streaming Output - there is no better output plugin
Otachan's ASIO Output - only slightly worse than Kernel Streaming, you want the stuff in the "Winamp5" section
DirectSound 2.2.0 Output - for the unlucky people that for some reason can't use any of the above