Simplenote is a free, cross-platform note-taking application focused on simplicity, speed, and real-time syncing for users needing essential note features.

Bear is a Markdown note taking app for organizing life

Joplin is an open source, end-to-end encrypted note-taking application for capturing thoughts and securely accessing them across all devices.

NotePlan is an all-in-one workspace blending tasks, notes, and calendar for tech-savvy professionals using Markdown.