So that's what happened.
The last time I bought from them (a few years ago now), I chose to buy an item from them instead of Amazon, to support less monolithic companies and because they used to have good reputation. I did this even though it was a few dollars more for the same item (like $23 vs $20, I think it was a dvd drive). It turns out they were just buying the Amazon item and reselling it at the higher price, it arrived in the original Amazon box with a new shipping label slapped on top.
VoiceAttack can be used to freely create arbitrary voice commands with pretty good recognition accuracy. It can send KB&M or gamepad inputs and run scripts and various other features. I used to use it to supplement controls for Elite: Dangerous and it worked pretty well. I imagine it'd get tiresome for complex games but could be good for simpler games, and for other computer tasks. https://voiceattack.com/Default.aspx
There are tons of potential accessibility devices like specialized buttons and breath control etc, but they're usually expensive medical devices or custom builds. The other commenters have already mentioned the consumer products I'm aware of.