Analysis Report: Mac OS X Panther (Version 10.3) Executive Summary Mac OS X Panther (10.3), released on October 24, 2003, represented a pivotal upgrade in the early OS X era, introducing over 150 new features. While it is no longer supported by Apple, it remains a significant legacy operating system for PowerPC-based hardware. YouTube +3 Core Specifications & Requirements To install Panther using original or archived ISO images, the hardware must meet these minimum standards: Wikipedia Processor
Mac OS X 10.3 Panther is abandonware in the strict legal sense. It is still copyrighted software owned by Apple Inc. While Apple has long stopped selling or supporting Panther, downloading an ISO from a torrent site or file-sharing repository is technically a violation of copyright law.
While technically illegal, the retro-computing community generally operates under the assumption that software which is no longer sold or supported by the vendor may be preserved for historical purposes. However, users should be aware of the legal status.
Panther introduced the sidebar in Finder windows, making navigation significantly faster.