https://github.com/YPares/arpligner - Arpligner - Multi-track & Polyphonic Arpeggiator
Arpligner is a multi-track & polyphonic arpeggiator which will use your own arpeggiation patterns (like 2Rule TugMidiSeq, LibreArp, Xfer Cthulhu, Reason PolyStep Sequencer, or FL's VFX Sequencer). It is packaged as VST3 & LV2 MIDI plugins and as a standalone application.
Multi-track: Multiple arpeggiation patterns can play at the same time for a given chord, each one in its own track of your DAW, or on its own MIDI channel,
Polyphonic: Each step can play several notes of a chord at the same time. "Steps" can also hold over an arbitrary length of time and overlap. So besides arpeggiation per se, you can do strumming or really any kind of "turning a plain block chord into something more interesting".