The goal of the LionWeb initiative is to create an ecosystem of interoperable components for building language-oriented modeling tools on the web. Such an ecosystem will allow for mixing and matching components of various language engineering tool sets, and, as a result, will facilitate the adoption of language engineering and modeling solutions by reducing vendor lock-in. It will also foster innovation, as incremental improvements can be defined on top of the existing libraries and components. To achieve this, the LionWeb initiative defines protocols for communication between participating software components, such as repositories, editors, and other clients. In this talk, we’ll introduce LionWeb with a particular focus on integrating different technologies. We’ll start with an overview of LionWeb as a whole, our perspective on web-based modeling tools, why we’re working on it, who is involved, and a sneak peek at some of the tools that are being developed in the vicinity. Then we’ll demonstrate how the LionWeb protocol can be used to exchange M2 and M1 models (i.e. language meta-models and their instantiations) between different language engineering tools. Last but not least, we’ll discuss why you should participate in the initiative.