Vult of course but the squinky labs one is good. Also like the liquid filter but there are quite a few I’m forgetting or haven’t got around to trying yet.
Vult and Lindenberg need to be in your library. Also recommend Stairway from Squinky Labs, and Feline by Valley. And lots more… just make a list, most of them are pretty great.
And don’t forget the Blamsoft filter! other than that, I think you got all mine. And yes, my filters range from the very characterful (Stairway) to the bizarre (Formants and Growler).
MindMeld MixMaster mixers have a HPF and LPF on every track which are good for basic mix filtering (the filters are in the track settings menu which you access by right-clicking on the track label.)
EQ Master is a 24 track 4 band parametric EQ and spectrum analyser which connects to MixMaster inserts using poly cables - giving you EQ on every track, group and Aux return.
If you want to do frequency splitting / crossover theres this frequency band splitter
For subtractive synthesis the vult filters offer great analog modelling sound with low cpu usage (especially the commercial ones - Freak from the compacts package is my favourite filter module since it contains all of them), Lindenberg Research filters also sound great but need a bit more cpu and are mostly monophonic only and Squinky Stairway is the most versatile among the free ones.