Simplenote recently released is a Light, clean, and open source note taking app. According to Simplenote blog page, Simplenote first started on iOS and has since expanded to include Android, Mac OS X, and now Windows and Linux. Simplenote app is built with React and runs on Electron. Simplenote Features History: drag the History slider to view previous versions. Collaboration: share your note with others and allow them to edit.