Oscope+
v1.1a:
http://forum.cockos.com/showthread.php?t=134869
v1.0:
http://forum.cockos.com/showthread.php?t=133801
James HE
Multi-receive spectrum analyzer
http://forum.cockos.com/showthread.php?t=33332
hq9000
JS-multifreaq is a tool that lets you see your mixing problems. You insert it into a track with up to 14 channels and route the tracks you want to observe instant frequency distributions of to the channels 1/2, 3/4... etc. For example: bass drum is sent to 1/2 and the bass to 3/4... and lead vocal to 5/6... in this case (if you only have 6 channels on the track) you'll see 3 different spectrums for each source.
Liteon's JS plugins pack
http://forum.cockos.com/showthread.php?t=27764
liteon
VUMeterGFX / VUMeterGFXSum (vumetergfx/vumetergfxsum)
- Vintage-style VU meter with response and release controls. Uses the GFX section to draw all graphics in real-time. Summed (L+R) and stereo versions.