Top Alternatives to QOwnNotes

Notepad++ is a free open source notepad replacement and code editor with nice features. It supports syntax highlighting for many languages and has an extension system as well.

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

Google Keep is a cloud based note taking application.

Notezilla is a sticky notes app for Windows.

Simplenote is an easy way to keep notes, lists, ideas and more.

Joplin is an open-source free note taking and to-do application.

Tomboy is a desktop note-taking application for Linux, Unix, Windows, and Mac OS X.

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

NixNote is an open source client for Evernote.

Notational Velocity is a software for Mac OS X used for notetaking. It allows users to create notes using solely a computer keyboard and search them using incremental find.

KeyNote-NF is a tabbed notebook with RichText editor, multi-level notes and strong encryption.

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

TagSpaces is an open source data manager and file navigator. It helps organize files on local drives by adding tags to files.

BasKet Note Pads is a KDE program for organizing, sharing, and taking notes.

nvALT 2 is a fork of the original Notational Velocity with some additional features and interface modifications, including MultiMarkdown functionality.

Leanote is a self-hosted note taking app.

Zoho Notebook takes the same catch-all approach as Evernote and OneNote, but has a few design ideas of its own.

nvpy is a simplenote-syncing note-taking tool inspired by Notational Velocity (and a little bit by nvALT too) on OSX and ResophNotes on Windows.

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 with each node of the tree.

GNotes is a simple and clear note app. It is available for you to take notes, keep a diary, write down ideas, create checklists, etc.

BeeCanvas is an online whiteboard based visual collaboration tool.

Elephant is a notetaker with a classic interface.