Download Modern De-Esser:

Traditional VST de-esser plugin

Modern De-Esser is a freeware de-esser VST plugin by Antress. It features frequency control in the 3000 to 9999 Hz range and output level control (-15 to +15 dB). The gain reduction can be adjusted with threshold, ratio, width, and release controls. The plugin has a relatively transparent sound and can effectively remove hiss and sibilants from your vocals. Use it when you want a quick dynamic processor to reduce some sharp, high frequencies. The Modern De-Esser VST is part of the free Antress Modern Plugins package. Only available as a 32-bit Windows VST.