A Wintel-compatible laptop with modern-day specs. Completely modular. Designed to be easy to fix, customize, and upgrade. Order a laptop or a kit; either can be customized upon order. Friendly to just about every open source OS out there. Every part is easily replaceable, even the mainboard. Internal peripherals (HDMI, card readers, bootable storage, etc) are on removable, hot swappable modules that are USB-C devices. Four expansion bays, two on either side. This is a serious laptop, not a toy.

Even lacks Optimus!

Split mechanical keyboard kits and other oddities.

A collection of greyprints for Construx parts.

Kit Space (formerly called Kitnic) is a registry of open hardware electronics projects that are ready for you to order and build. It could be described as a "Thingiverse for electronics". Click on any project to get further info, download the Gerbers and see the bill of materials.

Click once, order everything.

They sell replacement parts, refurb kits, and some upgrades for classic computers. Their official documentation is in a wiki: https://console5.com/wiki/

Online store for genetic research equipment, DIY kits.