Slides for LangDev 2022. Talk. http://langdevcon.org/ Pedro J. Molina: Essential 2.0 & Meow: Model Editors on the Web Essential is a Language Workbench and tooling for implementing Model Driven tools on .NET initiated in 2008. During this time the tool has been adapted to create metamodels, models, templates and model transformation in a complete integrated development environment (IDE). Essential has been used with success to prototype, create and evolve high-quality commercial code-generators. In the last years, works to migrate Essential to the Web (version 2.0) has been performed to allow using its potential for cloud-based application and in the browser. Quid is one of the first tools created using Essential for Web. Moreover, Essential 2.0 is totally web-based and parsers and model editors has been recreated from scratch into TypeScript to fully embrace the Web platform and provide easy tooling for creating modeling environments on the Web. In this sense, Meow is a companion library for Essential to allow dynamically edit models on the web enforcing an arbitrary Essential Metamodel. Bindings for importing and exporting EMF ECore Models are provided to make it easy to reuse models.