Notion (https://notion.so) All in one workspace, combines, trello, airtable, evernote, and docs. Great embed support and awesome for small teams and personal use. It's a modern day commonplace book.
I love Notion as a tool to use personally but it does not scale well. I was part of a working group that introduced Notion at my company and it worked great for a few months. Now that we have hundreds of pages it's _extremely hard_ to find the content that you're looking for. The search functionality is completely broken at scale to the point it recommends pages where the keyword you're looking for is in a paragraph over a page whose title is that keyword.
We just this week moved our sprints from Airtable to Notion. Seems like it will do everything we need--finally, we can have our sprints and our RFCs and other documentation in one place!
It's gotten faster and is getting faster over time. It was much, much worse a year ago which makes me believe that the team is paying attention to speed.
Compared to the main competitor mentioned here - Confluence - it is blazing fast.
I wouldn't say mind-numbingly slow, but it does struggle sometimes. The Android app is a bit poor as well in my opinion - gets the job done, but I've seen better ones by competitors.
Despite those issues, I have fully switched over to Notion. Instead of trying to force some very specific workflow onto you, it just offers a great toolkit that you can use to manage your own work whichever way you like it.
I would prefer a native app over a web app, but I guess that's just the world that we live in today.