Comment by brewmarche
1 hour ago
Swift comes to mind, and this website has more https://opensource.apple.com/projects/ (it lists WebKit, but I guess they count WebKit after it split from KHTML, I’d agree with you there)
Also, Bonjour originated at Apple and it is cross-platform, although Avahi probably is more popular
CUPS is associated with Apple as well, but it seems that it also did not originate there
Last I heard from CUPS they fired the only guy who was working on it?
last thing i found https://mjtsai.com/blog/2025/03/26/apples-dormant-cups/