Beat Marker Panel
Premiere Pro + After Effects / Free / MIT
Load a song, find its beats and drop markers into the timeline. Or select your clips and cut them to the music. A zoomable waveform, kick detection and manual beat editing give you room to adjust what the panel finds.
Still being tested and improved. Detection varies by song, so check the marks against what you hear. Runs locally, with no account needed.
View on GitHub