Top 20 ToDo Managers
Quire is a collaborative task management tool for organizing tasks in a tree-like structure wrapped in simple and user-friendly UI. Now supports Kanban.
Its unique visual tree structure allows you to see tasks, subtasks and their subtasks in a glance, without having to click into a particular task or getting an isolated task in a long list waiting to be forgotten.
Wekan, formerly LibreBoard, is an open-source and collaborative 
Trello -like kanban board application.
Whether you’re maintaining a personal todo list, planning your holidays with some friends, or working in a team on your next revolutionary idea, Kanban boards are an unbeatable tool to keep your things organized. They give you a visual overview of the current state of your project, and make you productive by allowing you to focus on the few items that matter the most.
Wekan supports most features you would expect of it including a real-time user interface, cards comments, member assignations, customizable labels, filtered views, and more.
Colorful & powerful sticky notes app for Windows & Phones. Set reminder alarms, attach them to any website or document, organize them using folders/tags, sync sticky notes between devices & send notes across LAN or to any contact across the globe.
TagSpaces is an open source personal data manager.
It helps you organize and browse your files on every platform.
Cross-platform file tagging and file finding
Organize your photos, ebooks, music, recipes or invoices in the same way on almost every platform. We currently support Windows, Linux, OS X, Android, Firefox and Chrome
With the help of tags you can do research better or you can manage projects using the GTD methodology.
The application persists the tags in the file names. As a consequence, the tagging information is not vendor locked and can be used even without the TagSpaces application. The absence of a database, makes syncing of the tag meta information easy across different devices with services like Dropbox.
TagSpaces features basic file management operations, so it can be used as tag-based file manager.
Evernote alternative for note taking and information management
You can create and edit notes in plain text, MARKDOWN and HTML file formats.
You can organize webpages saved in for example MHT or MHTML format.
You use TagSpaces to organize you e-book library, containing for example PDF or EPUB books.
You can create a personal wiki for tracking of your projects, ideas or memories.
Preview and navigation of your local file content
Browse your file system in a convenient and responsive user interface, familiar from the modern cloud based services.
Browse your digital photos, listen your local music and video content, open PDF documents and MHTML files. The list of supported files types for previewing and editing is constantly growing.
This feature makes the Chrome version of TagSpaces a perfect addition to the Google's Chromecast, with which your can cast your local documents, images, videos and music to your TV or other presentation device.
Self-hosted software is open source, Basic plan is free and Pro plan is paid.
Google Keep has several features including color coding notes, inserting images, creating lists, geo-fencing, shareable notes, and search by color.
Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Laverna is a JavaScript note taking application with Markdown editor and encryption support. Consider it like open source alternative to 
Evernote.
A digital notebook application that gives people one place to gather notes and information. .
Freedcamp is an alternative to Basecamp that has some free features, while some basic functionality is provided via purchased upgrades.
Wunderlist helps millions of people around the world capture their ideas, things to do and places to see.
Whether you’re sharing a grocery list with a loved one, working on a project, or planning a vacation, Wunderlist makes it easy to share your lists and collaborate with everyone in your life.
Wunderlist then instantly syncs between your phone, tablet and computer, so you can access your to-do lists from anywhere.
wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information. Links in a wiki are created by typing in WikiWords. A WikiWord is any mixed case word typed into the editor. TodoList or JohnDoe are example WikiWords. The term wiki means "quick" in Hawaiian, and wikis are all about quickly linking your information together. Wikis are not a new concept, in fact there are many web based wiki servers avai
TiddlyWiki is a highly customizable notewiki for capturing, organising and sharing complex information.
CintaNotes is an ultra-ergonomic, productivity-boosting notetaking app for Windows. It will help you collect, organize, and find any information.
Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more.
Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
easy install, cross platform, note taking. Sync notes between systems. Links between notes.
Zulip is a group chat app.
Its most distinctive characteristic is that messages are threaded by topic, helping you have long-running, organized conversations. Zulip's threading makes it easy for people not always on chat (like managers, remote team members, contractors, part-time workers, etc) to weigh in on questions and decisions, and for people in different timezones to effectively communicate. It also makes it easy to catch up on the 100s of messages a day that are typical for a busy user; since you can easily skim or ignore the threads that aren't relevant to you.
Full-history search
Search is both snappy and smart, helping you look for text, people, and threads of conversation, with advanced search operators for fine-grained control.
Team presence and buddy list
See who is online at a glance.
Inline image, video, and tweet previews
Send a link and we'll automatically generate an inline preview.
Fine-grained control over mobile, desktop, and email notifications
Stay informed in real-time without being overwhelmed.
Lightweight markup
Syntax highlighting, bulleted lists, clickable links, inline images, and more.
Private and public streams
Enjoy the benefits of threaded conversations while controlling your audience and privacy.
Hundreds of integrations
Get alerts and updates from your favorite services with off-the-shelf integrations for Jira, Trac, Nagios, Github, Jenkins, and more.
One-on-one and group private conversations
Have private conversations with one or as many people as you need.
Persistence
Zulip is always receiving messages for you, even when you're logged out.
Drag-and-drop file uploads
Drag a file into the compose box and we'll upload and preview it for you. Sharing and discussing work with teammates has never been easier.
Todoist is a task manager thats useful, fast and easy to use.
Accomplish more, every day.
Millions of people rely on Todoist to get things done.
Todoist lets you manage your tasks anywhere.
At home. At school. At work. Online. Offline. And on 13 platforms and devices.
MyLifeOrganized (MLO) is a personal task outliner and to-do list manager which will help you to organize your goals, projects and tasks into a tree.
The To-Do list with actions that require immediate attention will be generated.
This list of next actions will be sorted in order of priority to keep you focused on the most important tasks.
MLO is an ideal tool for Getting Things Done (GTD).
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.
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