Hi Qlikkies, James Fisher has published an excellent blog post (What Does It Mean To Be An Extension? | Qlik Blog) talking about our investments to allow developers to build new functionality that takes advantage of our engine and extends the capabilities of our analytics products.
He talks about the TED Program and the new fully supported Extension Bundles in Qlik Sense coming to the next releases.
"Contributors to this bundle have included our own field team members as well as external contributors from the Qlik Branch community. We are excited to be working with the Qlik ecosystem to provide more functionality and depth for Qlik Sense implementations with these supported bundled extensions."