I have worked with the following macOS (OS X) frameworks
IOKit, Core Animation, CoreData, PDFKit, CUPS, AppleScript, QTKit, USB comm, CoreAudio, DiskArbitration, GCD, Security, HIToolbox/Accessibility, custom UI elements design/implementation, network kernel extensions and user-mode networking
iOS Cocoa Touch and various 3d party frameworks
POSIX, TCP/IP networking, various unix libraries, Bash scripting, Linux administration.
C++, Qt, MFC, WinAPI, x86 assembly
ARM assembly, Single board computer bare metal programming, building cross-compiler toolchains