Are you looking for one that converts 60i to 24p with pulldown?
Just grain and color management?
The ones used out there are Magic Bullet, Sapphire, Digital Film Tools, and Boris. All of them at different price points and capabilities depending on your needs. Most of these plug-ins have down loadable demo versions for you to try.
I have Sapphire, Digital Film Tools, and Boris and will jump back and forth between them depending on the look I am trying to achieve. I also combine it with the color correction to get the overall look I am going after.
Here is an example of one I did with color correction and Boris:
https://www.24p.com/colorcorrection.htm
Michael