Lenovo https://www.lenovo.com/us/en/d/linux-laptops-desktops/
Dell https://www.dell.com/en-us/lp/linux-systems
Purism https://puri.sm
Kubuntu Focus https://kfocus.org
System76 https://system76.com
Slimbook https://slimbook.es/en/store
ThinkPenguin https://www.thinkpenguin.com
Star Labs https://starlabs.systems
Tuxedo https://www.tuxedocomputers.com
Nitrokey https://shop.nitrokey.com
LWL https://laptopwithlinux.com/
MintBox https://linuxmint.com/store.php
Technoethical https://tehnoetic.com
Minifree https://minifree.org
Libiquity https://www.libiquity.com
Vikings https://store.vikings.net/en
Respects Your Freedom https://ryf.fsf.org/categories/laptops
Similar software freedom refurbished brands:
Nitrokey https://shop.nitrokey.com/shop
MostlyHarmless https://mostlyharmless.io/computers
Debian https://www.debian.org/distrib/pre-installed
Entroware https://www.entroware.com
Juno https://junocomputers.com
Manjaro https://manjaro.org/hardware
MCEU https://www.manjarocomputer.eu
Nova https://configurelaptop.eu
PINE64 https://pine64.com
Sendero https://senderolinux.com
TLL https://thelinuxlaptop.com
Ubuntu https://help.ubuntu.com/community/UbuntuPre-installed
USB https://www.ubuntushop.be
WHY https://whyopencomputing.com/fr

via @sebsauvage