AFFiNE is a next-gen knowledge base that brings planning, sorting and creating all together. Privacy first, open-source, customizable and ready to use. AFFiNE is privacy focussed, offline-first application.
AFFiNE helps you to write, draw and plan all at once. Assemble any blocks you love on any canvas you like to enjoy seamless transitions between workflows with AFFiNE.
AFFiNE has support for modern block editor which can help you not only for docs, but slides and tables as well. It has a great support for collaboration, you can collaborate with yourself across devices and also collaborate with others in the team.
It is a great alternative to Notion and Mira.

AFFiNE - A privacy-focussed, local-first, open-source, and ready-to-use alternative for Notion & Miro

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. Tasks have a subject, description, priority, start date, due date, a completion date and an optional reminder. Tasks can recur on a daily, weekly or monthly basis. Tasks and notes can be assigned to user-defined categories.

Taskcoach - Todo manager to keep track of personal tasks and todo lists

This multi-purpose note-taking application helps you to Easily take all sort of notes, Collect research results and share them, Make intelligent To Do lists and lot more.

BasKet Note Pads - An system for organizing information in KDE

Tusk is an unofficial, featureful, open source, community-driven, free Evernote app used by people in more than 140 countries.It has support Multiple themes, Local & Global Customizable Keyboard Shortcuts, Scalable Interface, Export Notes as PDF, HTML & Markdown Files, Drag and Drag files.

Tusk - Refined Evernote desktop app

KeepNote is a note taking application in which you can store your class notes, TODO lists, research notes, journal entries, paper outlines, etc in a simple notebook hierarchy with rich-text formatting, images, and more. Using full-text search, you can retrieve any note for later reference. It supports Full-text search, Hierarchical organization for notes, Built-in backup and restore, Attachments and lot more.

Keepnote - Note Taking and Organization

LibreBoard is an open-source kanban board that let you organize things in cards, and cards in lists. You can use it alone, or with your team and family thanks to our real-time synchronisation feature. Libreboard is a land of liberty and you can implement all sort of workflows on it using tags, comments, member assignation, and many more.

Libreboard - An open-source kanban board

Organize your daily tasks in one place while making time tracking a lot less annoying. Super Productivity is a ToDo List / Time Tracker / Personal Jira Task Manager for Linux, MacOS and Windows aimed at reducing the time you spend with repetitive tasks and to provide you with a place to collect all the information you need to do your job.

super productivity - To Do List / Time Tracker with Jira Integration. Makes you super productive! 

QOwnNotes is the open source notepad with markdown support and todo list manager that works together with the default notes application of ownCloud and Nextcloud. You are able to write down your thoughts with QOwnNotes and edit or search for them later from your mobile device, like with CloudNotes or the ownCloud / Nextcloud web-service.
 
The notes are stored as plain text markdown files and are synced with Nextcloud's/ownCloud's file sync functionality. Of course other software, like Syncthing or Dropbox can be used too.

QOwnNotes is the open source notepad with markdown support and todo list manager that works together with the default notes application of ownCloud and Nextcloud. You are able to write down your thoughts with QOwnNotes and edit or search for them later from your mobile device, like with CloudNotes or the ownCloud / Nextcloud web-service.

QOwnNotes - Plain-text file notepad and todo-list manager with markdown support and ownCloud / Nextcloud integration

Personal wiki that lives in one self-modifying XHTML containing software, interface and data. Very useful for creating small websites and mantaining notes or todo-lists; completely javascript-programmable, supports encryption and file embedding.

WoaS - Wiki on a Stick

BATF helps to track bugs and features without using a full featured bug/feature tracker. It stores all your random notes such as server details, blog ideas, books to read, urls etc, without using a full featured CMS or the like. It has versioning support and it is  searchable.  

BATF - Big Arse Text File

wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. It can cross link your information. It features  include auto-completion, outline views, incremental search, easy source code navigation. IDE's that provide these features can greatly increase developer productivity.

 wikidPad - Wiki-like notebook for storing your thoughts and ideas

Notational Velocity is a modeless, mouseless Mac OS X note-taking application. The window was designed for keyboard input above all else, and thus has no buttons. There is no manual "saving" in Notational Velocity; all modifications take effect immediately. Synchronize natively with Simplenote, or via files in Dropbox with PlainText, Elements, iA Writer, and other iOS apps. All content is compressed and encrypted (enabled optionally) before it is recorded to disk.

Notational Velocity - Modeless, mouseless Mac OS X note-taking application

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