Important notification for Mac and Linux users:

BestFreePlugins is focused solely on music production software for use on PC's. Some of the VST plugins and audio production software on our site exist in non-PC versions as well, but since this is a site dedicated to PC VST plug-ins, we have decided not to use time and space to promote alternative formats.

Mac and Linux can, under certain conditions, use VST plugins in their music production:
Linux users can use the free DAW "Linux MultiMedia Studio" (find it in our free software studio / sequencer section). This DAW supports some PC VST's running under Linux, but not all...
Mac-users can use a VST to AU wrapper to convert the VST plugins into a format that Mac's can understand:
VSTAU is by far the best free VST to AU wrapper.