Neo-Riemannian Paths lists every path that goes from one chord to another using only the three transformations of neo-Riemannian theory, without repeating chords: P (parallel, from C to Cm), R (relative, from C to Am) and L (from C to Em). From C to C there are 7,976. Every path plays on the piano and downloads as MIDI.
You pick the starting chord and the ending chord and the list appears. Each row has its own play button and a button to download the MIDI in root position, with a marker for each chord for your DAW. In the other tabs you add secondary dominants or 2-5-1s before the chords you choose, and with a right-click (or a long press on your phone) you add them to a single chord.
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