The free one.
Filtret is the free, lighter-weight sibling to Filtra, built to show off the engine and the parts of the workflow that arrived with it. We would rather hand you something to run than ask you to take our word for either.
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A parametric equalizer running the engine Filtra runs. You draw a response and it sounds the way it looks, to about 0.6 dB, with no added latency.
What it does not have is the warp stack, the part of Filtra that takes the finished curve and moves it as one object. Filtret draws the curve. Filtra plays with it afterwards.
It is not a trial and it does not expire. It goes through the same account, license and activation as the paid one, so if you buy Filtra later, nothing about your setup changes.