Tasks.org: A Libre Task Manager and Reminder for Android

Tasks.org is a free open-source to-do list manager, and reminder for android devices. It comes with a straightforward interface for almost any sort of users, and include a dozen of useful productivity booster features.

The app works completely offline, but it can sync to Google Tasks, CalDAV, and EteSync.

The app comes without any advertisements of any sort, or ads, Opt-out, or any third-party tracking tools.

By default, Task.org supports nested subtasks, end-to-end encryption, task list sharing, and custom reminders.

Tasks.org highlights

Nested subtasks with unlimited depth
Powerful repeating task options
End-to-end encryption with EteSync
List sharing available when synchronized with CalDAV or EteSync
Location-based arrival and departure notifications
Tag, filter, and search your tasks
Drag and drop manual sorting for Google Tasks
Customize your lists with different icons and colors
Hide tasks until a later date
Automatically add tasks to your calendar
Create new tasks and list reminders with Tasker
It is compatible with Outlook, Thunderbird, Apple Reminders
Customizable and multilingual Extensive options for customizing the look and feel of Tasks. Use Tasks in your language
You can self-host your server edition
Supports dark theme, and user custom them