Hey, Open Native's goal is to be framework agnostic in terms of native modules & plugins. Right now NativeScript/React Native/Flutter all have their own native modules & plugins maintained by their communities, the problem with this is that it's a lot of duplicated effort to rewrite the same library/module in multiple frameworks over and over. Open Native allows you to write a module once & run it with any cross-platform framework.
NativeScript itself on the other hand is web framework agnostic which is a different thing. Open Native is more like a plugin you can install in a NativeScript app & use react native modules.