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. Since its adaptation to display products, webOS has come a long way and evolved into a software platform applicable to a broader range of products.
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. On top of the core architecture of webOS, webOS OSE offers additional features that allow extension to more diverse industry verticals.
This release seems light on changes, as the release notes illustrate.