Joplin is an open-source note and to-do app initiated in 2016 by French developer Laurent Cozic, supporting Markdown, end-to-end encryption and multi-platform sync with data servers in Paris, France (GDPR), 45,000+ GitHub stars, and optional Joplin Cloud from EUR 2.99/month.
Amplenote is an all-in-one notes, tasks, and calendar productivity tool known for nested tags and bullet journal style, with a free tier and paid plans around $8/month, ideal for time-focused knowledge workers.
Microsoft To Do is a free task management app launched by Microsoft in 2017, deeply integrated with Microsoft 365 and Outlook, available across 5 platforms at no cost — the handiest to-do tool for Microsoft ecosystem users.
Any.do is a cross-platform to-do app known for minimalist design and smart reminders, serving tens of millions of users globally across iOS, Android, Web, and more, with a free tier and Premium from about $3/month.