Old Microvision Nomad units from around 2004 pop up on eBay from time to time. I have one; it's a monocular red laser retinal projection display, with a permanently attached computing unit running an ancient version of Windows CE. It's bulky, finicky, and nowhere near open source; there's hardly any documentation for it, but it does work somewhat. I haven't done anything interesting with it yet, because it doesn't have a IMU, and integrating one with it has been difficult.

Microsoft Hololens 2 also used Microvision-derived laser retinal projection technology. I don't have one, so I can't say how well it really works, but Microsoft seems to have given up on it as well.

If you relax your requirements and allow for a green holographic waveguide display, there are a few other options, but still nothing open source that I'm aware of.