1.20.2 - Eaglercraft

Eaglercraft exists in a bit of a gray area. It is a fan-made project and is not affiliated with Mojang or Microsoft. To stay safe:

Eaglercraft is not a simple screen-sharing or remote-play client. It is a true, from-scratch rewrite of the Minecraft Java Edition engine. Version 1.20.2 brings the "Trails & Tales" update features to the browser, including the Sniffer mob, the Cherry Grove biome, and the Archaeology system—all without a single download or installation. eaglercraft 1.20.2

Enhanced support for modern 1.20+ server plugins, such as GeyserMC and ViaVersion, allowing seamless connection to modern, non-Eagler servers. Eaglercraft exists in a bit of a gray area

While you may find "1.20" or "1.20.2" clients, these are typically rather than native ports. Current Project Status including the Sniffer mob