The Ozone plugin, developed by iZotope (now part of Native Instruments), is a comprehensive mastering suite offering various versions like Elements, Standard, and Advanced, alongside a free EQ plugin. It's lauded for its AI-powered Master Assistant, which analyzes tracks and suggests starting points, and includes features like Transient/Sustain control, Upward Compress, and Master Rebalance. Advanced versions offer tools like Clarity, Low End Focus, and Stem Focus. Reviews praise its ease of use, sound quality, and extensive features, making it a valuable tool for both beginners and professionals in achieving polished, release-ready masters, though some advanced features are limited to pricier versions. It supports major plugin formats on both Mac and Windows, integrating with most DAWs. Ozone can be purchased from the Native Instruments website and retailers, often with free trials available, and the Ozone 11 EQ is a free download.