Erica Synths BLACK Sequencer (Patreon)
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I've been really impressed by this. It's got 4 tracks, and loads of options - repeating steps, ratchets and arpeggio per step. It also has a modulation output per channel which can send out individual envelopes per step, LFOs, triggers, CV and note info... so well more than just a 4 track sequencer once you start digging in.
Most impressive of all is the user interface. Much of the eurorack stuff I encounter can be a bit inpenetrable (maybe that's deliberate .. haha).. but once you know how this works - which takes all of 10 seconds, you can find your way to everything really easily.