GNExceptions(Defenensive-code-related) exceptions for Objective-CLicense: MITObjective CGNLogLogging utility for Objective-C/SwiftLicense: MITObjective CGNPairpair utility for Objective-CLicense: MITObjective CGNPreconditionsDefenensive-code tool for Objective-CLicense: MITObjective CGNTestingAsynchronous testing tool for Objective-C/SwiftLicense: MITObjective CGNThreadPoolthread pool for Objective-CLicense: MITObjective C++