Links to resources you may not know about
SynthFont
and other tools for Midi and SoundFonts
DontCrack - "The ultimate Audio Freeware resource for Mac and PC."

Music Business: Producer - "Your resource for the music industry, including record companies, music biz attorneys, managers, and producer info."

Shareware Music Machine at Hitsquad - a large list of computer music resources

MAZ Sound Tools - "Retro Gaming & Music, Sound Software, Sounds, Demoscene: Symphonic Shades VSampler Synthesizer MadTracker Immortal MindCandy Amiga Demos DVD Freax C64 Orchestra"

KVR Audio - "KVR Audio Plugin Resources, news and information about open standard audio plugins (virtual instruments and virtual effects) - VST and VSTi, Audio Units (AU), DirectX and DXi, LADSPA, DSSI, etc."

Synthzone - "Synth Zone is your one-stop midi and synthesizer resource directory. Coverage for all type of synthesizers & midi controllers , plus all relevant music software & support products."

Tweakbench - Free VST plugins, free VST instruments and free VST effects

APSLive pugins section - "Here You will find some really good Sites where You can download FreeDirectX and VST Plugins!"

Big Tick Audio - "We develop cutting-edge, professional audio software for PC." There are some free plugins to grab.

Kjaerhus Audio - "Professioanl audio plugins". There are some free very good effects to grab.

Musica - has links to various music software, shareware, demos and freeware.

AudioMelody - "Computer music resources with downloads of audio software and tutorials and guides for mixing and recording"

Free Plugin List - "the ultimate free vst plugins list. Free vst plugins, free audio software."

TabTrax - "Tab converter player. Drum music editor. Percussion teaching and notation writing software."

VST Planet - "The site provides a lot of freeware plugins and audio software for playing,composing and producing music."

Anwida has ONE free VST effect, the DX Reverb Light: "Based on a reduced version of the DX Reverb, the DX Reverb Light is the ULTIMATE FREE reverb plug-in for PC And Mac.". It is actually a pretty good free reverb.
What more?

If you know of a site you think is worth listing here, then please contact me.