http://www.mda-vst.com/
http://www.ele4music.com/plugins.html

Has a decent gate:
http://www.mgaudio.de/modules/main.php

List of many available:
http://www.ctgmusic.com/community-articles.php?type=2&id=9

Guitar specific ones
http://www.guitarists.net/forum/view_bb.php?forum=10&thread=32091

Some cool ones, main good one is the free autotune
http://www.gvst.co.uk/downloads.htm

BlueLine Audio

http://www.kjaerhusaudio.com/

Juicy 77
Studio Devil
Voxengo Boogex

http://www.ultimatemetal.com/forum/andy-sneap/361418-coming-out-closet-pirating-no-more-me.html

http://www.ultimatemetal.com/forum/equipment/307088-free-vst-central-thread.html

Drumkit Free
http://www.bluenoise.no/

Soft Sampler that is free
http://vemberaudio.se/shortcircuit.php

Free Drum Replacement
http://www.boxsounds.com/vst.html

Drum Sampler
http://www.majken.se/content/view/6/9/lang,en/
http://www.kvraudio.com/get/2111.html