I gather that Veertu has (had?) a product called Veertu Desktop and it was open sourced, but they've wiped any mention of it from their website in favor of Anka Flow/Device/Build (commercial license only).

This looks like the source, found in a github repo of someone who works for Cisco. Maybe a former Veertu employee, or just someone who happened to fork a copy before Veertu deleted it? At any rate, I can't find an official Veertu repo anymore. https://github.com/tithomas1/vdhh

Last updates were 2 years ago and the installation instructions say "To Install Veertu Desktop on Mac, please visit veertu.com" which has deleted everything related to Veertu Desktop down to the knowledge base articles with release notes https://twitter.com/veertu_labs/status/818584467954495488

Seems like a pretty thoroughly dead product. Haven't heard of xhyve before, but between the two that's the one worth looking at.

Not only open sourced, but GPLv2'd. Ripe for forking, if one felt so inclined.

Sure but GPLv2 doesn't help you if all copies of the source code are gone, so be sure to grab a copy of that vdhh repo now in case tithomas1 removes his.

I imagine it's not in a working state on current versions of macOS, what with the security changes that Apple makes pretty much every year. But if someone wanted to try to get it going again they certainly could.

Docker for Mac has moved from VirtualBox to the built-in hypervisor.

I have the impression that causes some pain when it starts eating away battery faster than the monitor can charge the laptop.

Hmm, never noticed that; to the contrary, in my practice, Docker's VM eats CPU less aggressively than VirtualBox's.

Indeed, it's called HyperKit[0][1], and it's based straight off xhyve[2].

Also, there's docker-machine-driver-xhyve for people that prefer using docker-machine (like I do) instead of DfM.

[0]: https://github.com/moby/hyperkit

[1]: https://blog.docker.com/2016/05/docker-unikernels-open-sourc...

[2]: https://github.com/moby/hyperkit/tree/master/src/

Last time I tried, reasonably recent kernels (like 4.15 or so) failed to boot under Veertu, for no apparent reason.

Have they improved?

Xhyve looks promising, but it’s really new and at this stage it lacks all but the most basic documentation.