OmniOutliner is a start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From grocery lists to email drafts to long-form composition.




EssentialPIM is described as 'The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions' and is a popular todo list manager in the office & productivity category. There are more than 100 alternatives to EssentialPIM for a variety of platforms, including Windows, Mac, Web-based, iPhone and Android apps. The best EssentialPIM alternative is Microsoft Outlook. It's not free, so if you're looking for a free alternative, you could try TreeSheets or Evolution. Other great apps like EssentialPIM are eM Client, Quire, ToDoList and ClickUp.
OmniOutliner is a start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From grocery lists to email drafts to long-form composition.




Nirvana is a secure, cloud-based GTD® task manager accessible from your desktop web browser and mobile devices. If you have more to do than you can manage in your head, or if you want greater clarity of mind and focus in life, Nirvana is for you.



The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.




Widget Board is a productivity tool that lets you create custom boards with your favorite widgets such as tasks, notes, media, date & time, weather, calendar and so much more!.




Simple GTD application to manage your tasks and to-dos. Syncs with web server. Complete with the usual Inbox, Today, Next, Tomorrow, Scheduled and Someday "buckets" as most GTD programs have. You can also create Projects for tasks with multiple steps.




Track your tasks and projects in a plain text file, todo.txt. A todo.txt is software and operating system agnostic; it's searchable, portable, lightweight and easily manipulated.

Android and iPhone official apps are no longer maintained. Todo.txt CLI seems still developed: latest version, 2.12.0, released in August 2020, can be still downloaded from GitHub


Merkuro is a calendar and contact application that allows you to manage your tasks, events and contacts. Merkuro supports both local calendars as well as a multitude of online calendars: Nextcloud, Google® Calendar, Outlook®, Caldav, and many more.




Trello like kanban board. Tasks, to-dos, chat, etc., Restyaboard is based on Restya platform with dual License (OSL 3.0 & Commercial License).



Strikethrough is a minimalist to-do app for Android that brings back the simple pleasure of the paper list.




RightNote will help you get a grip on information overload. It is designed to be easy to use for the new-comer, but also provide advanced features once your notes start to accumulate. RightNote can store text notes, source code, spreadsheets and webpages.




Take control of your schedule and get reminded wherever and however you want. Instantly access your appointments, tasks, and notes with a simple glance at a transparent calendar that sits right on your Windows desktop.



SquidHub is a simple, fun and flexible way to collaborate with friends, family and co-workers. Get a great overview and say goodbye to stress.




Todo.txt does not have a calender.