Streaks - The to-do list that helps you form good habits.
Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.
Taskful - Deadlines, meet your match.
UpNote - A beautiful and clean cross-platform app for notes organizer
Gone - An ephemeral to-do list
Notesnook - Notesnook is a simple and private note taking app that keeps your notes organized and synced on your phone, tablet and computer.