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 **[NextCloud](https://nextcloud.com/)** | A complete self-hosted productivity platform, with a strong community and growing [app store](https://apps.nextcloud.com). NextCloud is similar to (but arguably more complete than) Google Drive, Office 365 and Dropbox, originally it was a fork from [OwnCloud](https://owncloud.org/), but since have diverged. Clear UI and stable native apps across all platforms, and also supports file sync. Supports encrypted files, but you need to configure this yourself. Fully open source, so you can self-host it yourself (or use a hosted solution, starting from $5/ month)
 **[Disroot](https://disroot.org)** | A platform providing online services based on principles of freedom, privacy, federation and decentralization. It is an implementation of NextCloud, with strong encryption configured - it is widely used by journalists, activists and whistle-blowers. It is fre to use, but there have been reported reliability issues of the cloud services
 **[Sandstorm](https://sandstorm.io/)** | An open source platform for self-hosting web apps. Once you've set it up, you can install items from the Sandstorm [App Market](https://apps.sandstorm.io/) with -click, similar to NextCloud in terms of flexibility
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+**[Vikunja](https://vikunja.io)** | Vikunja is an open-source to-do application. It is suitable for a wide variety of projects, supporting List, Gantt, Table and Kanban views to visualize all tasks in different contexts. For collaboration, it has sharing support via private teams or public links. It can be self-hosted or used as a managed service for a small fee.
 
 ## Backup and Sync