There is a free Pultec style EQ from Acustica Audio called “Coffee the PUn”, Analog sampled plugins for mixing and mastering - Acustica Audio I like it better on kick drum than on bass, what I really like is the NoiseAsh VST version: Rule Tec EQ1A | NoiseAsh Inc there is also a free version from Ignite Amps which I have not tried: IGNITE AMPS - Engineering for the moshpit