Ableton LIVE
http://www.ableton.com
using Live is very easy, it's simple to replace traditionnal CD players but LIVE does much more!!

Jade
http://www.electrotap.com/jade/
about Jade

Plogge BIDULE
http://www.plogue.com/
cool software, seems to be Max but not. Good Montréal job

Pluggo
http://www.cycling74.com
create your vst pluggins and use your favorite Host application, u could customize some good Host with Max algorithm!

SeqCon
http://hapax84.free.fr/telecharg.html
free software for show conductor

Cricket
http://cricketsound.com/
very similar than SeqCon

ARGO - modular sound tools with Max/MSP and Runtime
http://perso.orange.fr/Paresys/ARGO/index.html