Drumgizmo

My favorite open-source drum-sampler, I use it mainly inside Ardour but I have also used it for e-drums.
It's not fancy to look at, but it has relatively low resource demand, and can even be run on a headless setup.
The last time I was recording in a studio, I asked the tech to record some single-strokes of my kit, I've used those samples to recreate my own kit in Drumgizmo.
Building your own drum-kit can be a bit time-consuming, but there are a couple of great free kits to download on their site if you don't have your own samples.

I used it on this track:
moster

Moster is a danish word meaning something like "mom's sister", I wrote this when I learned that my sister just had a kid.

I used ffmpeg to generate the video from the audio-file, using this one line in the terminal:
ffmpeg -i moster.wav -filter_complex "[0:a]showspectrum=s=hd1080[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy spectrum.mkv