Freeware - Monoplugs B-Step Sequencer VST Plugin

https://www.kvraudio.com/product/b-step-sequencer-by-monoplugs

B-Step Sequencer is a unique, powerful step sequencer plugin and standalone application for creating melodic loops, chord progressions, arpeggios, drum grooves, and basslines. B-Step Sequencer comes with an array of features like chord programming, sequencer ratcheting, shuffle, drag-n-drop, copy, MIDI learn, and much, much more. An embedded manual and intelligently sorted presets help users get up to speed quickly.