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Nextcloud AIO stands for Nextcloud All-in-One and provides easy deployment and maintenance with most features included in this one Nextcloud instance.
This. And OP also take a look at Nextcloud-AIO https://github.com/nextcloud/all-in-one#how-to-change-the-nextcloud-apps-that-are-installed-on-the-first-startup
Collaborative office suite, end-to-end encrypted and open-source.
Appwrite - The Open Source Firebase alternative introduces iOS support . Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
Markdown as a platform
If you just want to run something simple locally you could also try silverbullet: https://github.com/silverbulletmd/silverbullet It's a neat little note taking app in the browser using markdown and it also has a collab plugin https://silverbullet.md/%F0%9F%94%8C_Collab for collaboration with others
My productivity app for the past 12 years has been a single .txt file
7 projects | news.ycombinator.com | 23 Dec 2021
Trying to find the 'perfect' notes app/service
2 projects | /r/selfhosted | 8 Feb 2023
Offline, Secure, note-taking/planning solution?
2 projects | /r/PrivacyGuides | 14 May 2022
Are there markdown note/wiki apps like joplin with a web view and vim keybinds?
2 projects | /r/selfhosted | 9 Jun 2023
Looking for a note taking app with inline tags.
4 projects | /r/selfhosted | 7 Jun 2023