Naive LPF v0.5 is a resonant low-pass filter with envelope follower. Version 0.5 now has a GUI made with VSTGUI.
This filter has been developed to closely model the way some real world analog circuits work to achieve a vintage, analog feel.
You will find this filter has a very warm, even distorted, analog flavor. But the distortion it does impart tends to sound very musical to the ear, particularly when processing individual instrument tracks.
Download the plug-in from Admiral Quality VSTs.