New Mac User, get the most out of my home studio Options

[malice666]

hi all, I'm a new mac user (imac g5 10.4) and I own a korg triton extreme, roland juno2, roland super jd990 and a roland ef303. I'd like to know wich software I can use to get the best out of my machines (especialy the korg)
I have used sofwares on pc before (rebirth, reason, fruity loops, sound forge) but they were all free without instructions so we can say I've never used a "real" sofware.
thanx in advance