Linux

Real-time Linux is officially part of the kernel after decades of debate - https://arstechnica.com/gadgets/2024/09/real-time-linux-is-officially-part-of-the-kernel-after-decades-of-debate/ - Now you can run your space laser or audio production without specialty patches.

Torvalds wrote the original code for printk, a debugging tool that can pinpoint exact moments where a process crashes, but also introduces latency that runs counter to real-time computing.
"Controlling a laster (Laser) with Linux is crazy," Torvalds said at the Kernel Summit of 2006, "but everyone in this room is crazy in his own way. So if you want to use Linux to control an industrial welding laser, I have no problem with your using PREEMPT_RT." Roughly 18 years later, Torvalds and the kernel team, including longtime maintainer and champion-of-real-time Steven Rostedt, have made it even easier to do that kind of thing.