Nembrini Audio offers a nice distortion effect plugin free for a limited time.
It has two stages of distortion:
– Distortion – This is a fine tuned clip algorithm designed to limit the transients as happens using a real analogue signal chain and increase the density of your tracks.
– Saturation – Saturation is a special designed algorithm that mimics the behavior of vintage analog equipments like old tape machines and mixing console input/output stage.
We’ve also just published an article on the best distortion VST, feel free to check it out for more free and paid suggestions.