[bonsai80]

I remember a ROM distribution similar to this, where the maintainer/company also sold used phones with it preinstalled. I thought it was LineageOS, but looking at the LineageOS site I'm definitely remembering that wrong. Does anyone know the name for what I'm describing?

[callahad]

You may also be thinking of CopperheadOS (https://copperhead.co/).

[Youden]

You're likely thinking of Cyanogen OS (distinct from CyanogenMod) and the OnePlus One, which shipped with it.

[BitRain]

you're thinking of CyanogenMod, LineageOS was born out of Cyanogen running out of money and the maintainers dropping it.