Forgive me if this thread already exists, but it might be good to get a list of free plug-ins, especially good ones that you'd recommend to others.
Obviously there's the
KVR database, filtered here for all free Windows effects.
There's a short list on this
German site.
Digital Fish Phones has some good compressors.
Soundhack's +decimate is a good bit/sample reducer.
Who's got a good, low CPU rent brick wall limiter?