Well, clangd is a Google project, which Apple has decided to start contributing to, so probably doesn’t belong on your list.
Apple, like everyone else, wants to commoditize their complements.
Clang was an Apple project from the start.. I'm not sure what is telling you it is a Google project
Clangd != clang.
Woolvalley said “and now recently clangd“, which is a source code completion server which began its life at Google.
Clang did start its life with Apple.
In case a citation is needed: https://en.wikipedia.org/wiki/Clang
> Apple chose to develop a new compiler front end from scratch, supporting C, Objective-C and C++. This "clang" project was open-sourced in July 2007.
I believe the "d" in the GP comment was not a typo https://news.ycombinator.com/item?id=16874734
I don't think they will ever move 'secret sauce' into open source, but infrastructural things like DBs and dev tooling seems to be going in that direction.