For example, Slack has an App Store as does Shopify (they call it integrations)
https://github.com/wekan/wekan/wiki/Browser-compatibility-ma...
It's also possible to make PWA icon for iOS, etc: https://github.com/wekan/wekan/wiki/PWA
Intercom
Salesforce
Atlassian
Chrome store
Gong
MS Teams
Service Now
Adalo (sort of, a react component library)