As already reported earlier this year, Keyboarddweeb's Alex Miller (aka doesntfazer) is giving away one-handed keyboards to anyone with a disability who needs one. These are Octoplus Trios with the artsey/ardux layout, and the PCB is now open source.
I will be giving away Octoplus Trio’s to anyone who has lost the ability to use their right arm. It’s an 8 key artsyio layout with dedicated space bar, backspace and shift keys and a Cirque trackpad – Alex.
This is only for the left hand, but the plan is to make a right-handed version depending on interest. In fact, it looks like the right handed version is already done but isn't available in the repo yet.
Specs
11 keys (4x2+3)
left (or right) handed
MX, hotswap
Cirque trackpad support
In addition, Alex launched a dedicated subreddit for accessible peripherals for disabled people, check out r/AccessiblePeripherals.
If you don't know me, you might not have known that my life-long dream was to be an engineer. A dear friend of mine's wife lost their leg in a motorcycle accident. After that, I pivoted that dream to being a robotic prosthetic engineer. I think a good step in that direction is to work on accessible computer peripherals – Alex.
According to Alex, the left handed versions should be shipping out mid-March, and he will be streaming his progress on every build on the keyboarddweebs YouTube channel.