Managify - Create & organize all your documents in a single platform.
Zim Wiki - Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.
Sismics Docs - Lightweight full-featured document management system 📁
Scribbleton - The little personal wiki.
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
MyInfo - MyInfo is the most versatile organizer for Windows