Here is a free VST plugin that is definitely worth checking out. The CamelCrusher from Camel Audio is a nice little plugin that adds 1 part distortion, 1 part compressor, 1 part filter which equals 3 parts phat-ness! Camel Audio describe it as a 'colouring' multi-effect plugin.

Features include:

• Two different distortion types.
• Warm, analogue-modelled resonant low-pass filter.
• High quality, easy-to-use compressor, with 'Phat' mode.
• Powerful 'MIDI Learn' function.
• A collection of useful Preset patches to get you started.
• Randomize for instant inspiration.

Here's a screenshot for your viewing pleasure:

Visit the Camel Audio site to download the free CamelCrusher plugin.