Blackbird: a desktop PC with zero proprietary blobs! Running the Power ISA (like PowerPC), although it's not cheap.
https://www.osnews.com/story/133093/review-blackbird-secure-desktop-a-fully-open-source-modern-power9-workstation-without-any-proprietary-code/
miniblog.
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OSS components are so common in software stacks now. It might be an interesting exercise to try to build a e.g. a web service with 100% proprietary components.
Reading the beta 4 release notes for Haiku R1, it's striking how much work it is to support modern WiFi protocols: https://www.haiku-os.org/get-haiku/r1beta4/release-notes/
Previously, 802.11ac was only supported on Linux and OpenBSD! (Ignoring proprietary operating systems)
When a project is 90%+ open source, it's hard to sell a proprietary bundle on top. OpenOffice/Star Office had this problem: Star Office had a grammar checker as its main selling point IIRC.
This is a problem when the bundle funds much of the development work.

