Boostnote is an open source note-taking app made for programmers just like you. Your markdown notes are saved automatically as you write and various formatting options have semi-live previews so you can double check what you’re writing. Text is formatted as you type.
 
For code snippets the app is able to highlight code syntax in more than 100 languages, including Javascript, Python, HTML and CSS and you can store multiple code snippets within the same snippet. Easy to write notes from anywhere, even if you're offline. When you update notes on your laptop, they are also reflected on your mobile devices.

Boostnote is an open source note-taking app made for programmers just like you. Your markdown notes are saved automatically as you write and various formatting options have semi-live previews so you can double check what you’re writing. Text is formatted as you type.



Boostnote - Note-taking app made for programmers just like you.

 The Markdown-based note-taking app that doesn't suck. I couldn't find a note-taking app that ticked all the boxes I'm interested in: notes are written and rendered in GitHub-Flavored Markdown, no WYSIWYG, no proprietary formats, I can run a search & replace across all notes, notes support attachments, the app isn't bloated, the app has a pretty interface, tags are indefinitely nestable and can import Evernote notes (because that's what I was using before).

notable - The Markdown-based note-taking app that doesn't suck

Foam is a personal knowledge management and sharing system inspired by Roam Research, built on Visual Studio Code and GitHub. You can use Foam for organising your research, keeping re-discoverable notes, writing long-form content and, optionally, publishing it to the web.
 
Its features include&nbsp;
<ul>
<li>Graph Visualization - See how your notes are connected via a graph</li>
<li>Link Autocompletion - Create the connections between your notes, and your placeholders as well</li>
<li>Unique identifiers across directories - Supports files with the same name in multiple directories</li>
<li>Navigation in Preview - Navigate your rendered notes in the VS Code preview panel</li>
<li>Note embed - Embed the content from other notes</li>
<li>Templates - Use custom templates to have avoid repetitve work on your notes</li>
<li>Backlinks Panel - Quickly check which notes are referencing the currently active note</li>
<li>Syntax highlight - highlights wikilinks and placeholder differently, to help you visualize your knowledge base</li>
</ul>

Foam is a personal knowledge management and sharing system inspired by Roam Research, built on Visual Studio Code and GitHub. You can use Foam for organising your research, keeping re-discoverable notes, writing long-form content and, optionally, publishing it to the web.

foam - A personal knowledge management and sharing system for VSCode

Dendron is an open-source, local-first, markdown-based, note-taking tool. It's a personal knowledge management solution (PKM) built specifically for developers and integrates natively with IDEs like VS Code and VSCodium.
 
Most PKM tools help you create notes but slam into a wall retrieving them once your knowledge base reaches a certain size threshold. That threshold varies with the tool, but virtually everything stops working past 10k notes unless the user was extremely diligent about organizing their knowledge. Past this threshold, entropy wins and every query becomes a keyword search and scrolling through pages of results. 
 
Dendron's mission is to help humans organize, find, and work with any amount of knowledge. It not only helps you create notes but also retrieve them retrieval works as well with ten notes as it does with ten thousand.

Dendron is an open-source, local-first, markdown-based, note-taking tool. It's a personal knowledge management solution (PKM) built specifically for developers and integrates natively with IDEs like VS Code and VSCodium.

Dendron - The personal knowledge management (PKM) tool that grows as you do!

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

Laverna is a JavaScript note-taking web application with a Markdown editor and encryption support. It's built to be an open source alternative to Evernote. The application stores all your notes in your browser databases such as indexedDB or localStorage, which is good for security reasons, because only you have access to them.
 
Data is secured using client-side encryption, Manage your notes, even when you're offline, Synchronizes with cloud storage services (currently only with Dropbox and RemoteStorage), Syntax highlighting, MathJax support.

Laverna is a JavaScript note-taking web application with a Markdown editor and encryption support. It's built to be an open source alternative to Evernote. The application stores all your notes in your browser databases such as indexedDB or localStorage, which is good for security reasons, because only you have access to them.

Laverna - Note taking application with Markdown editor and encryption support

Joplin is a note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format. Notes exported from Evernote via .enex files can be imported into Joplin, including the formatted content (which is converted to Markdown), resources (images, attachments, etc.) and complete metadata (geolocation, updated time, created time, etc.). Plain Markdown files can also be imported. Full text search is available on all platforms to quickly find the information you need. The app can be customised using plugins and themes, and you can also easily create your own.
It maintains Revisions (Note history), Synchronisation with various services, including Nextcloud, Dropbox, WebDAV and OneDrive. End To End Encryption, File attachment, Inline display of PDF, Geo-location and Multiple language support.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format. 

Joplin - A note taking and to-do application with synchronization capabilities for Windows, macOS, Linux, Android and iOS

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

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

Logseq is a platform for knowledge management and collaboration. It focuses on privacy, longevity, and user control. The server will never store or analyze your private notes. It works on top of local plain-text Markdown and Org-mode files. Use it to write, organize and share your thoughts, keep your to-do list, and build your own digital garden. It provides support to organize your tasks and projects with built-in workflow commands. 

Logseq - Platform for knowledge management and collaboration.

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

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