"I have compiled a list of all the free RTAS
plug-ins I could think of. The list is nowhere near
as long as a free VST list would be but nonetheless
there are quite a few handy plug-ins here. Needless
to say, while this is an RTAS plug-in list, most of
them should be available in VST and AU as well."
bx_solo – M/S tool.
Structure Free – Free sampler.
SignalTools – Metering and analysis.
RTAS plug ins list