Virtual Studio Technology
You need a plugin host – i.e. a VST Host Application – to be able to use your VST Effects Plugins (and VST Instruments Plugins). For free VST effects and instruments plugins, and even news and reviews of commercial VST effects, instruments and hosts, see KVR VST Audio Plug-in Resources. KVR VST lists hundreds of freeware instrument and effect plug-ins that can be downloaded on the web.
Commercial VST Host Applications
Free VST Host Applications