My Experience

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

UNIX technologies

POSIX, TCP/IP networking, various unix libraries, Bash scripting, Linux administration.

Windows frameworks

C++, Qt, MFC, WinAPI, x86 assembly

General

SQLite, XMPP and Web services (interacting with SOAP/RESTful services, JSON and XML parsing), basics of OpenGL, Qt (cross platform UI dev), HTML, CSS, JavaScript, UI design.