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.

Libation does the same for free (and is FOSS).

Saved comments appear in that tab but they seem to be listed at the bottom below all saved posts, regardless of when they were added.

New people are born every day and still have the opportunity to see Trek for the first time.

You may be interested in the Fallout: London conversion mod, which is planned to release later this year.

You can use Playnite as a FOSS GUI that works with multiple backends including Steam, Itch, Epic, and others. It's not a seamless experience and you still need the first party clients installed but it makes it way easier to manage & play games across multiple libraries.

It's not exactly the same but you can use the SponsorBlock addon to skip the non-music segments of music videos when playing in browser, and for Android there's a fork of NewPipe that has this integrated.