@mosgaard the kazrog filter is in my kit at the moment. It just does the one thing really but it's a good thing.
The tal I have used previously, it sounds good and does a lot of tricks filter freak (and pan man and tremolator) can do. I already had the sound toys and artyria stuff and they work fine but if I didn't it would be a good option.
I have a few audio thing plugins including lines - which is huge fun and makes it's way into most mixes in some shape or form. I like their Things series. Crusher has some crossover with filter freak - bubbles gets the most use. Dials sounds great and is maybe a more direct replacement, but I don't need a direct replacement.
Filterstation is the straightest dropin replacement for filterfreak (in terms of the types of things it can do / versatility / the way I think about what and how the processing is doing), is newer code and honestly probably 'better' in most regards. But when AD didn't used to make plugins that worked directly in protools and by the time they did I already had soundtoys stuff.