Freemium

Evernote is a note taking application which keeps the notes taken in sync across all platforms using its cloud infrastructure.

NoteLedge

Commercial

NoteLedge note-taking and management solution.

NixNote

Open Source

NixNote is an open source client for Evernote.

ResophNotes

Free

ResophNotes is a fast note writing tool and a Simplenote client on Windows.

Tabbles

Freemium

Tabbles is a relational file manager, running on Windows systems.

Nimbus Note

Freemium

Nimbus Note is a powerful notes app and organizer.

Leanote

Open Source

Leanote is a self-hosted note taking app.

EasyFind

Free

EasyFind is an alternative tool to Spotlight, OS X's built-in search tool.

QOwnNotes

Open Source

QOwnNotes is a free open source (GPL) plain-text notepad with markdown support and todo list manager for GNU/Linux, MacOS and Windows, that (optionally) works…

Zim

Open Source

Zim is a graphical text editor used to maintain a collection of wiki pages.

CherryTree

Open Source

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

RecentX

Commercial

RecentX is a launcher for Windows designed to make your computing life joyful.

Polar

Open Source

Polar is an integrated reading environment to actively read, annotate, create flashcards, and track progress.

Evernote Web Clipper

Free

Evernote Web Clipper is a simple extension for your web browser that lets you capture full-page articles, images, selected text, important emails, and any web…

Nuclino

Freemium

Nuclino is a cloud-based team collaboration software which allows teams to collaborate and share information in real-time.

The Guide

Open Source

Guide is an application that allows you create documents ("guides") which inherently have a tree (which you can modify as you please) and text associated wit…