http://free-plugin-list.com/free-vst-plugins.php - hundreds of them.
But actually answering the question, or sort-of... this comes from a post of mine on the Adobe forums:-
"I'm a sucker for free vst effects (and instruments, but that's another story).
However, when it comes to post-production of classical music, there's a slew of them I know I shall never use. Just by way of sharing information, here's the list I've now included in the folder Audition scans, after pruning out the weird and not-so-wonderful.
Analysis:
Inspector
Voxengo Span
Compression:
The Fish Fillets - Blockfish, Floorfish, Spitfish
BuzMaxi3
BuzMaxi
C3multibandcomp
Classic Compressor
Classic Master Limiter
Endorphin
E-Phonic XPressor
GComp
George Yohng's W1 limiter
GeneComp3
GeneComp
Grancomp3
Grancomp
msComp
StComp_v1r
TLs_Maximizer1.1
TLs_SaturatedDriver
TLs_pocket_limiter
Delay:
Karlette
msDelay
EQ:
Classic EQ
LPGEQ
NyquistEQ
ParisEQ
PLParEQ1
Reverb:
Ambience
Classic Reverb
FreeverbToo16
KarmaFX Reverb
Glaceverb
RoomMachine844
SIR
WAReverb
Tools:
BitViewer
C_Superstereo
msBalance
msDecode
msEncode
msSwap
QSpectPro
Sonogram SG-1
StereoTools
TapeIt
VoxengoMSED
General:
Luxonix LFX1310
If those names raise curiosity that Google doesn't satisfy, let me know and I'll try to provide detail."
However, it's probably out of date....