Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Creativity 365 - Cross-device content creation suite
TiddlyWiki - a non-linear personal web notebook