HackerBoards is an established comparison website for any single-board computer (SBC), module (SoM) and Linux-supported development board. With over 450 active entries, Board-DB is the largest online database and comparison tool for single board computers (SBCs), computing modules (SoMs), and development boards.

Another variant of single-board computers that folks like to call Pis these days. Cheap, lots of different sizes and features. Shipped from China. Has both ARM and x86 boards. Not compatible with RasPi cases. GPU acceleration for AI/ML tasks specifically supported.

Official wiki: https://wiki.radxa.com/

The best hacker's gadgets for Red Team pentesters and security researchers.

ARM based single board computers that try to suck less. Roughly the same form factor and capabilities of the Raspberry Pi. I'm told that you can just drop Armbian onto a card and boot it up.

The BASIC Engine is a very low-cost single-board home computer with advanced 2D color graphics and sound capabilities, roughly comparable to late-1980s or early-1990s computers and video game consoles. It can be built at home without special skills or tools and using readily available components for under 10 Euros in parts, or mass-produced for even less.