Recently the W3C announced MiniApps:
MiniApp as a new form of mobile application, leveraging both Web technologies (especially CSS and JavaScript) as well as capabilities of native application.
I was a bit confused about them at first, and thought they were directly competing with PWAs. Thankfully Thomas Steiner chimed in, referring to a whole presentation on MiniApps he made.
Enlightening stuff. A video recording + transcript are also available.
Learning from MiniApps: Slides →
Learning from MiniApps: Video + Transcript →