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.

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

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

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

Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images. Pages are stored in a folder structure, like in an outliner, and can have attachments. Creating a new page is as easy as linking to a nonexistent page. All data is stored in plain text files with wiki formatting. 
 
This tool can be used to keep track of TODO lists or ideas, to take notes during a meeting or to draft any other kind of text (blog entries, important mails, etc.).

Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images. Pages are stored in a folder structure, like in an outliner, and can have attachments. Creating a new page is as easy as linking to a nonexistent page. All data is stored in plain text files with wiki formatting. Zim can be used to Keep an archive of notes, 


Zim - A Desktop Wiki

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

Standard Notes is the 100 year notes app. It's built long-lasting so you never have to find another one. It syncs on all your devices. It encrypts your data to protect your privacy. And it backs up your notes so you never lose anything again. 
 
Standard Notes comprises of two main technologies that work together to ensure a private, secure experience. One is the core stack of Standard Notes client applications. On the other end is a simple framework called Standard File used for encrypting data locally and syncing it to the cloud.

Standard Notes is the 100 year notes app. It's built long-lasting so you never have to find another one. It syncs on all your devices. It encrypts your data to protect your privacy. And it backs up your notes so you never lose anything again. 

Standard Notes - Your notes for good

OpenBoard is an open source cross-platform interactive white board application designed primarily for use in schools. It was originally forked from Open-Sankoré, which was itself based on Uniboard.  It is a tool that can help you do your job and does not get in the way. Use a pen tablet, an interactive whiteboard or even a mouse to write and annotate your course. 

OpenBoard - Interactive whiteboard for schools and universities

A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.
 
Its features: 
<ul>
<li>rich text (foreground color, background color, bold, italic, underline, strikethrough, small, h1, h2, h3, h4, h5, h6, subscript, superscript, monospace)</li>
<li>syntax highlighting supporting several programming languages</li>
<li>images handling: insertion in the text, edit (resize/rotate), save as png file</li>
<li>embedded files handling: insertion in the text, save to disk</li>
<li>multi-level lists handling (bulleted, numbered, to-do and switch between them, multiline with shift+enter)</li>
<li>simple tables handling (cells with plain text), cut/copy/paste row, import/export as csv file</li>
<li>codeboxes handling: boxes of plain text (optionally with syntax highlighting) into rich text, import/export as text file</li>
<li>execution of the code for code nodes and codeboxes; the terminal and the command per syntax highlighting&nbsp;is configurable in the preferences dialog</li>
<li>alignment of text, images, tables and codeboxes (left/center/right/fill)</li>
<li>hyperlinks associated to text and images (links to webpages, links to nodes/nodes + anchors, links to files, links to folders)</li>
<li>spell check (using gspell)</li>
<li>intra application copy/paste: supported single images, single codeboxes, single tables and a compound selection of rich text, images, codeboxes and tables</li>
<li>cross application copy/paste (tested with libreoffice and gmail): supported single images, single codeboxes, single tables and a compound selection of rich text, images, codeboxes and tables</li>
<li>copying a list of files from the file manager and pasting in cherrytree will create a list of links to files, images are recognized and inserted in the text</li>
<li>print &amp; save as pdf file of a selection / node / node and subnodes / the whole tree</li>
<li>export to html of a selection / node / node and subnodes / the whole tree</li>
<li>export to plain text of a selection / node / node and subnodes / the whole tree</li>
<li>toc generation for a node / node and subnodes / the whole tree, based on headers h1, h2 and h3</li>
<li>find a node, find in selected node, find in selected node and subnodes, find in all nodes</li>
<li>replace in nodes names, replace in selected node, replace in selected node and subnodes, replace in all nodes</li>
<li>iteration of the latest find, iteration of the latest replace, iteration of the latest applied text formatting</li>
<li>import from html file, import from folder of html files</li>
<li>import from plain text file, import from folder of plain text files</li>
<li>import from basket, cherrytree, epim html, gnote, keepnote, keynote, knowit, mempad, notecase, rednotebook, tomboy, treepad lite, tuxcards, zim</li>
<li>export to cherrytree file of a selection / node / node and subnodes / the whole tree</li>
<li>password protection (using http://www.7-zip.org/) – NOTE: while a cherrytree password protected document is opened, an unprotected copy is extracted to a temporary folder of the filesystem; this copy is removed when you close cherrytree</li>
<li>tree nodes drag and drop</li>
<li>automatic link to web page if writing the URL</li>
<li>automatic link to node if writing node name surrounded by [[node name]]</li>
</ul>

A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

CherryTree - A hierarchical note taking application

Civilizer is a note taking or personal knowledge management application that helps you efficiently manage your personal data/knowledge/idea etc. However, it has many advanced features to let you efficiently create your note/memo and organize and search them. It supports most of major Web browsers. 

Civilizer - Cleverly manage your data/knowledge/idea

NixNote is an free, open source program designed to help you take notes and stay organized. You can create text notes, attach files or images, and enen synchronize with Evernote so you can have your notes whevere you go.

Nixnote - A clone of Evernote for Linux

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