Editing Foundation Kit (section)

==Major implementations==
===macOS and iOS ===
The Foundation Kit is part of the macOS [[Cocoa (API)|Cocoa]] API.  Beginning as the successor to [[OPENSTEP#OPENSTEP.2FMach|OPENSTEP/Mach]], this framework has deviated from [[OpenStep]] compliance, and is in some places incompatible. The Foundation Kit is in the iOS [[Cocoa Touch]] API.  This framework is based on the macOS Cocoa.

===GNUstep===
The Foundation Kit is implemented in [[GNUstep]]'s Base Package (libs-base).  This implementation is mostly comparable (4 classes are missing) and aims to be comparable with both the [[OpenStep]] API and later [[macOS]] additions. The missing classes have been dropped by Apple as well.<ref>{{cite web |title=OpenStep Compliance |url=http://www.gnustep.org/resources/documentation/Developer/Base/General/OpenStepCompliance.html |website=GNUstep (Base) |accessdate=17 February 2020}}</ref>

===Cocotron===
The Foundation Kit is implemented in [http://www.cocotron.org/ Cocotron], an open-source implementation of Cocoa. It is also a part of [[Darling (software)|Darling]].

===PureFoundation===
[https://code.google.com/p/purefoundation/ PureFoundation] is an open-source implementation of Foundation that implements Foundation by wrapping [[Core Foundation]], just like in Cocoa, rather than create a separate Foundation from scratch like GNUstep and Cocotron.

===SwiftFoundation===
SwiftFoundation (swift-corelibs-foundation) is Apple's open-source [[Swift (programming language)|Swift]] implementation of the Foundation API for platforms where there is no Objective-C runtime. It also includes an implementation of [[Core Foundation]].<ref>{{cite web |title=swift-corelibs-foundation|website=GitHub|url=https://github.com/apple/swift-corelibs-foundation}}</ref>

===ApportableFoundation===
ApportableFoundation is an implementation of Foundation Kit (Foundation, CoreFoundation, and CFNetwork) based on Apple's CFLite release. It works on [[Android (operating system)|Android]] and other [[Linux]] systems, and makes up part of the Darling macOS translation layer for Linux.