What are all Accessibility tools available in open source that can be used in Linux?

Accessibility is a very essential and growing aspect in the tech industry.
But many people don’t know what are all the open source accessibility software available.
So I kindly request the Linux community to share what are all the open source Linux compatible accessibility software available

This question is initially raised in TossConf23 online talk on Sep03.
https://www.youtube.com/live/CxhI80Z8tZM?feature=shared – Initial question raised at TossConf23

Thanks for your time to read and answering this question.