I pushed the first alpha release of my cross-platform Swift DSP framework called Lullaby on Github!
It is far from usable, but hopefully in the future it will become something useful to people interested in computer music.
I hope you'll come and check it out, and maybe give me some feedback or tips. I am a musician first and foremost, so I don't have a lot of knowledge in DSP.
ps. I am thinking of replacing libsoundio with something more versatile, and more actively maintained. I am open for any suggestions!
ps2. On macOS, unsafe linker options has to be enabled to include C library for some reason. It is not really desirable since Xcode seems to prohibit building a project that depends on a package that has unsafe linker options. If anyone has a fix, please let me know.