Some more...
11. Blockfish
Great compressor with characteristics.
12. Kjaerhus Classic Series
Classic Compressor pictured Really good vintage style auto-filter, chorus, flanger, phaser, compressor, eq, delay, reverb and limiter
13. TAL-Tube
Tube saturator with additional amplifier mode.
14. MB Spatty
Mid side gain to adjust stereowidth
15. LMC-1
SSL's own free replication of the original listen mic compressor.
16. GVST GComp
RMS/Peak and soft knee compressor. Also check out GClip, a clipper with free soft knee setting.
17. Electri-Q (Posihfopit)
Flexible graphic parametric EQ. Also don't forget to check the Electri-Q manual out about different filter types and how they work.
18. JB Ferox
Tape Saturation plugin. JB also has lots of other great plugins, amongst them a psychoacoustic compressor...
19. Stardust
Channel/mastering processor.
20. Basslane
Tightens bass stereofield without affecting other freq's.
21. YouWaShock
Multiband limiter based on four Maximus presets, pretty much the same as FL Studio Soundgooderizer.
22. Wow & Flutter
Speed imperfection emulator.
23. Colortone Free
Analog signal path emulator.
24. Nebula 3 Free
Vintage gear emulator multi-fx containg compressors, eq's, saturation etc... CPU hog, but really great sound!
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Other nice effect plugs are off course interruptor's different delays, Izotope's Vinyl and the Tapestop plugin as well as GVST's GRevDly
(a reverse delay) and the different guitar amp-emulators like Studio Devil Britich Valve Custom, Fretted Synth's Free Amp 3, Cortex and the Simulanalog Guitar Suite.
I would definitely recommend the Voxengo Overtone GEQ, Pushtec, Rescue, Tessla and TLS Saturated Driver Steve mentioned as well.