Notion.

US all-in-one workspace for notes, docs, and project management

Facts

Nuclino
German collaborative knowledge base and wiki
DE · commercial
↗
XWiki
French enterprise wiki; self-host.
FR · open-source
↗
Nextcloud
Open-source self-hosted collaboration platform for file sync, chat, and office
DE · open-source
↗
BookStack (self-host)
Self-hosted documentation and wiki platform
EU · open-source
↗
Kanboard
French open-source kanban project management
FR · open-source
↗
Leantime
German open-source project management for strategy and execution
DE · open-source
↗
OpenProject
German open-source project management software with Gantt, boards, and BIM
DE · open-source
↗
Planka
German open-source kanban board as Trello alternative
DE · open-source
↗