Apps

• Ice - Menu Bar Manager
  • jordanbaird/Ice Powerful menu bar manager for macOS
• Mortennn/Dozer Hide menu bar icons on macOS

misc.

• GNUstep.org is set of frameworks and tools suited for development of advanced GUI desktop applications or server applications; it is available on variety of platforms and architectures and allows to write portable code. GNUstep core closely follows Apple's Cocoa APIs.
  • GitHub
    • libs-base The GNUstep Base Library is a library of general-purpose, non-graphical Objective C objects.