plumio

Cross-platform hierarchical note taking application with focus on building large personal knowledge bases (fork of Trilium Notes).

Realtime collaborative markdown notes on all platforms, formerly known as CodiMD and HackMD CE.

A notes app built for quick capture: text notes, checklists, images, drawings, links, attachments, labels, colors, and reminders (alternative to Google Keep).

Collaborative writing, worldbuilding and D&D-session-planning app. Tools for organizing your notes and stories.

Knowledge base that works with a SQLite db file.

Note taking application with markdown editor and encryption support for mobile and desktop platforms. Runs client-side and syncs through your own Nextcloud instance or similar (alternative to Evernote).