I find this website extremely useful for getting plugins for my digital recording software.
There are all kind of plugins; instrument plugins, effects plugins, and much more. If you need reverb, they've got it. How about distortion, echo, or flange effects? The website has them!!
The site has free and commercial software for Windows, Mac, and Linux, so you can pick and choose from a wide variety of tools for your digital recording needs. Program formats include VST, DX, and AU.
My first time surfing the website I had to control myself so I didn't download everything I put my cursor on. In my opinion this is THE website to go for your audio plugin needs. Check it out!