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Tons of stuff. We've got everyone in FAANG but Netflix, Microsoft, Cloudflare... different people have different definitions of "widely-used/public."

Anyway, two big projects in a similar space to QEMU are Firecracker (the underlying virtualization tech for AWS Lambda + Fargate), and Crostini (the underlying virtualization tech for ChromeOS). Firecracker started life as a fork of Crostini and now there's a rich ecosystem going on in this space.

Don't forget the Rust code from Servo that lives in Firefox, too.

Thanks. With "widely-used/public" I was hoping for something open source that runs on many people's machines (like a web browser) or at least on many company's servers (like qemu) as opposed to running on a single company's servers in a controlled and uniform environment.

Both of those things are open source, incidentally :)

Yeah, it's tough to get the combo of all of those things, for other reasons too. I would probably want to first reach for VS: Code, which uses ripgrep for search. But that's a "important component written in Rust", rather than a whole-Rust project. There's tons of tools like ripgrep, which is the most well-known, but it's hard to say how popular they are. And there are things like 1password, which do run on people's machines, but aren't open source.

I actually have recently seen a bug report that implies something really, really huge in this space, but I don't want to jinx it, so I'm not gonna link just yet. We'll see :)

The crosvm project which powers crostini is both open source ( https://chromium.googlesource.com/chromiumos/platform/crosvm... ) and on many people's machine (most Chromebooks) which might fit some definition of not controlled and not uniform.

Firecracker is fantastic, but it's also --- to its great credit --- substantially smaller than Servo.

100%. I picked it because we're in a thread about QEMU, and it's an important part of a well-known product. I am also glad that it's a lot smaller, as it should be. I figured that, when discussing a "halo project," popularity is more important than sheer size.

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