Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
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.
TiddlyWiki - a non-linear personal web notebook
Creativity 365 - Cross-device content creation suite
Confluence - Confluence is content collaboration software that changes how modern teams work