AHOY! Alternatives

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.

Standard Notes is a simple and private notes app. It allows you to write and sync your notes across all your devices, including your iPhone, iPad, Mac, and web browser.

Microsoft OneNote, part of the Microsoft Office Suite, is a digital notebook application that gives people one place to gather notes and information.

Google Keep is a service provided by Google which integrates note-taking and web surfing.

Evernote is a cross-platform, freemium app designed for note taking, organizing, and archiving.

Made by the company behind WordPress, Simplenote enables users to take notes, lists, and ideas. These notes are stored on the cloud and are accessible across multiple devices.

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

Plain text notepad with markdown support and todo list manager for Linux, Mac OS X and Windows, that works together with the notes application of ownCloud.

CintaNotes is an ultra-ergonomic, productivity-boosting notetaking app for Windows. It will help you collect, organize, and find any information.

Tomboy is a desktop note-taking application for Linux, Unix, Windows, and Mac OS X. Simple and easy to use, but with potential to help you organize the ideas and information you deal with every day.