1. KpctabscontrolA macOS control for tabs with enhanced capabilities, and styles: Safari, Chrome and custom ones.
2. SwiftaaThe most comprehensive collection of accurate astronomical algorithms in (C++, Objective-C and) Swift.
3. KPCJumpBarControlA macOS jump bar similar to Xcode's allowing to navigate accross a tree of objects
4. KPCSplitPanesA smart subclass of NSSplitView, that splits well and allows you to easily add new panes, and combine horizontal and vertical panes.
5. QLFitsThe macOS quicklook plugin for FITS files.