Variety of Sound offers free vst plugins on their page. Among them you can find eqs, reverbs, limiters etc. Apart from that, they also have quite an interesting blog.
http://varietyofsound.wordpress.com/downloads
In case you're wondering why all this is being offered for free, here's a statement by "vos":
As a computer scientist and musician, I’m enjoying designing DSP algorithms and plug-in concepts. It’s a pleasure for me to share my efforts with other people without having to worry about commercial interests. In each of my effects there is a special technical design, workflow or concept combination I haven’t found in existing tools. Many developers these days just stick to old concepts, but you will never see a straight copy of existing gear from me. I always add some innovation, or find a way to evolve and take it to a new level.