Cubase SX A standard in multitracking sequencing
SONAR 2.2 From Cakewalk's creators
Acid Pro 4.0 A loop-based multitracking tool
Vegas Audio 4.0 From Sonic Foundry another easy-to-use audio tool
Cool Edit Pro 64 tracks to express your ideas
Wavelab 4.0 Very powerful audio editor. From Steinberg
Sound Forge 6.0 Professional audio editing from Sonic Foundry
Recycle 2.0 Timestretching & pitch transpose never so easy
Cool Edit 2000 Turn your pc in a recording studio
Rebirth 2.0.1 Emulator of Roland machines TB303, TR808, TR909
Reason 2 From Propellerheads a great Sound Studio Module
Storm Something like Reason. More less resources needed
Reaktor 3 VST/Standalone synth. What a sound!
Dynamo VST/Standalone synth
Absynth VST/Standalone synth
Battery VST/Standalone drum sampler. This rocks!
Pro 53 VST synth
FM7 VST synth with FM sound synthesis
Mercury-1 VST synth
Traktor Dj 2.0 Mix your wav & mp3 files like on a dj console
Spektral Delay Design your fx shapes to create unbelievable sounds
TC Native Bundle 3.0 Dx professional processing tools
Acid Xpress 3.0 Free version of Acid Pro 3.0
Multitrack Studio Audio/midi multitrack recorder
AXS Synth/sampler/tracker. Some drumkits also
Quartz Audio Master Limited functionality version of this multitrack
Fat Rock Studio Audio multitrack recorder
Tiny Wave Audio editor
Audacity Audio editor
Wave Flow Audio editor
RM F Drum machine
HammerHead Drum machine
Orangator Synth/sound generator
Visual Orangator Like Orangator, but modular
GakStoar Alpha VST 2.0 soft synth
DrumSynth What more can I say?
FreeVerb Add atmospheres to your songs
Wav-normalizer Utility that allows you to normalize your songs
Analog-X Visit this site to find a lot of free utilities