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I'm not using any their products, but I believe they are known for providing an alternative to yubikeys.

EDIT: actually, it seems that Purism's Librem key is (was?) based on the Nitrokey.

I am using their FIDO 2 USB-Keys for 2FA. First I was sceptical too, but they are on the market for quite a while and I like their fully FOSS approach which Yubikey does not provide. Some of their products seem a bit overpriced, because you can do everything by yourself, but if I count all the hours and days spent with unlocking Bootloaders, searching ROMs and debugging them, this offer seems worth the price.

I've bought a number of their Nitrokey HSM 2's and been very happy with them. But that is pretty much the extent of my knowledge of them.