For laptops, there's Schenker/XMG (afaik similar to system76, based on barebones, not fully custom designs, which would be somewhere between extremely hard and impossible as a small company)

For desktops, there's tons of small companies building systems from stock components.

I recently bought one of the Star Lites from these guys: https://starlabs.systems

Very nice machine so far. My only real complaint is the trackpad. Coming from years of Macs and a Pixelbook, it was a shock to the fingers.

The 13 inch machine has a glass touchpad, so presumably that’s not a complaint there.

Either way, reasonable price, works well, arrived very quickly.

I think in america(?) they might be called Clevo.

It's good if you want a portable gaming desktop, but they are not exactly compact.

Is there a good website where I can find indie computer builders?

You may find useful this forum post on European CLEVO resellers: http://forum.notebookreview.com/threads/clevo-resellers-in-t...

I consult this list every once in a while: https://en.wikipedia.org/wiki/List_of_laptop_brands_and_manu...

Building based on clevo designs (as system76 is doing) there is tuxedo (based in germany)