Another ultra-small trackball would be the one used for the MNT Reform[0] (which also happens to be open hardware). However, I don't know if it's fully ready-t

Another ultra-small trackball would be the one used for the MNT Reform[0] (which also happens to be open hardware). However, I don't know if it's fully ready-to-use with any arbitrary computer, yet. I know it's intended to be possible to be used with any computer but you'd have to check into that yourself. If you're interested and willing to be patient about it just keep an eye on the creator's mastodon account[1] where he posts all the most up-to-the-minute updates about the project. Or, heck, send him a message to ask about it :) [0] https://www.crowdsupply.com/mnt/reform https://www.crowdsupply.com/mnt/reform [1] https://mastodon.social/@mntmn https://mastodon.social/@mntmn