It's confusing. I tried to find out who is behind it now and on what platforms it runs, and this is from the About page: "webOS is a web-centric and usability-

It's confusing. I tried to find out who is behind it now and on what platforms it runs, and this is from the About page: "webOS is a web-centric and usability-focused software platform for smart devices, which has proven its performance and stability in over 70 million LG Smart TVs. ... The open source project of webOS, called webOS Open Source Edition (OSE), was announced in March 2018 under the philosophy of open platform, open partnership, and open connectivity" The FAQ however claims: Officially, webOS OSE 1.x and 2.0 only supports Raspberry Pi 3 and 4, respectively. However, as webOS OSE is an open source project, it is your call to decide whether to implement webOS OSE on any other form factors. Also there is "Tier 3 support" for ROS 2, the robotic operating system, whatever that means. It supports developing applications in C/C++ with Qt but also enactJs which is based on React.