The best open source alternative to Google Keep is Joplin. If that doesn't suit you, our users have ranked more than 100 alternatives to Google Keep and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Keep are Standard Notes, Simplenote, Notesnook and Turtl.
Marknote lets you create rich text notes and easily organise them into notebooks. You can personalise your notebooks by choosing an icon and accent color for each one, making it easy to distinguish between them and keep your notes at your fingertips.
Secure device-synced notepad using AES-GCM-256 encryption to protect confidential data. Features include a tree-structure for note organization, historical changes tracking, and collaboration options. Supports all major platforms with cloud sync and offline access.
Carnet is a complete and rich note taking app for Android and Linux that can be synced with NextCloud (selfhosted) or the official Carnet server.
It has a great UI and it is Open Source.
Offline-first, self-hostable note app supporting rich text formatting, tag-based organization, customizable backgrounds, pinning, search, archiving, admin management, trash recovery, mobile and web access, sync, privacy safeguards, and dark or light themes.
A minimalistic notes app. Notally it's extremely light, minimalistic and elegant. There are minimal dependencies and lines of code. (All without compromising on readability).
A privacy-first, lightweight note-taking service. Easily capture and share your great thoughts.
Silver Bullet is an extensible, open source, personal knowledge management system. Indeed, that’s fancy talk for “a note-taking app with links.” However, Silver Bullet goes a bit beyond just that.
OpenNotas is an open-source note-taking application, cross-platform based on PWA, focusing on security and device synchronization.
Quillpad is a fork of an original app called Quillnote. The development stopped on the original app and PR backlogs were not cleared up. The community showed much interest in the app for continued development and so this fork was created.
Iotas is a simple but elegant solution for notes especially but not only for GNOME users. Through Nextcloud integration, all notes can be kept in sync and accessed on different devices.
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It's very similar to google keep, offering the same functionality and even importing notes from google keep (from linux), making the switch much easier