[Toad]

I have the Topaz bundle of filters for PhotoShop. Some of them are really quite good, some are just so-so. THey gave me an excellent deal on the bundle so the so-so ones are pretty much free. What I really like about them is that they are regularly updating the filters with new features and improvements, and the updates are all free to existing customers.

I wouldn't say that any of them are a go-to tool, but I do like to play around with them when I am trying to do something more stylized.