There are some areas where open source struggles to keep up.
Collaborative document editing is a big one. We don't love a lot of the existing solutions (Collabora, OnlyOffice, Outline).
We are super excited by the emerging project of Docs: https://github.com/suitenumerique/docs
It has a public funding model which could be really interesting and a viable Google Docs competitor that's already been deployed at a reasonably large scale.
We look to seeing what other projects emerge.