Accessibility to computers for people with vision, hearing, or physical impairments needs to be a part of fundamental design, and not an afterthought. Progress in the proprietary world is slow, and even slower in the Linux/FOSS world. But thanks to some dedicated people some significant work has been accomplished, and the groundwork laid for a common platform for all Linux distributions to build on.
Everyone knows and loves Linus Torvalds, the creator of Linux. Mark Shuttleworth, the creator of Ubuntu Linux, is pretty famous. Richard Stallman, the founder of the Free Software Foundation and creator of the GPL, is equal parts famous and infamous. But surely there is more to Linux and Free/Open Source software than these three. And indeed there are thousands upon thousands of people toiling away fueling the mighty FOSS engine; here is a small sampling of these important contributors who make the FOSS world go 'round.
Arthur C. Clarke said "Any sufficiently advanced technology is indistinguishable from magic." And it's still magical when you understand how it works. 3D printers are here, they're cool, and there is a large and enthusiastic open source 3D printer movement.