PowerPlant is an object-oriented GUI toolkit, application framework and set of class libraries for the Classic Mac OS, created by Metrowerks.
[1] After Metrowerks was acquired by Motorola, then spun out as part of Freescale Semiconductor, PowerPlant and the rest of the CodeWarrior desktop development tools were discontinued.
[6] In 2000, as Apple revised its transition plans, PowerPlant was ported to Carbon, with the Aqua user interface on MacOS X, offering a solution for developers wanting to support the new operating system.
[8] In February 2006, the PowerPlant class libraries were released as open source under the BSD license hosted on SourceForge.
[9] Although it could theoretically be recompiled for x86-64 Macs, it is Carbon-dependent and therefore can only be used in 32-bit mode, which preclude its use for software to run on macOS Catalina or later as 32-bit application support was dropped by the system.