Best Free & Open Source Alternatives to Dropbox

Syncthing is an open-source, continuous file synchronization program that synchronizes files between two or more computers in real time. Unlike Dropbox or Google Drive, Syncthing transfers data directly between your devices using a peer-to-peer protocol — no data ever passes through or is stored on a central cloud server.

Syncthing works across Windows, macOS, Linux, Android, and other platforms. It features conflict resolution, selective sync, per-folder ignoring rules, and encrypted node connections using TLS. An optional relay infrastructure helps when devices cannot connect directly (e.g., both behind NAT), but communication is always encrypted end-to-end.

Because there is no central server, there is no subscription, no storage limit (except your own devices), and no company with access to your files. Syncthing is particularly popular among privacy-conscious users and self-hosters who want cloud-like convenience without the cloud.

OpenCloud is an open source file management and collaboration platform designed as a sovereign alternative to proprietary cloud storage services. It enables teams to store, sync, and share files securely while keeping full control over their data.

Built for simplicity and modern infrastructure, OpenCloud supports self-hosting and provides a clean, intuitive interface for managing documents and collaborating with others. It is designed to be lightweight and easy to deploy compared to heavier alternatives.

With an Apache-2.0 license and active development, OpenCloud is a strong choice for organizations that want the convenience of cloud collaboration without the vendor lock-in of services like Google Drive, Dropbox, or Microsoft SharePoint.

Paperless-ngx is an open-source document management system that transforms your physical paper documents into a searchable online archive. It uses OCR (Optical Character Recognition) to extract text from scanned documents, making every word searchable.

Key features include automatic document tagging using machine learning based on the content of your documents, correspondent and type classification, custom metadata fields, PDF thumbnails, and a clean modern web interface. Documents can be added via the web UI, email, or a watched folder.

Paperless-ngx is a community-maintained fork of the original Paperless and paperless-ng projects, combining the best improvements. It integrates well with document scanners and supports bulk operations. For home users and small offices drowning in paper, it provides a powerful and private alternative to cloud document management services like Google Drive or Dropbox.

SafeBucket is an open-source, self-hosted file sharing platform designed for teams that want full control over their data. Unlike traditional cloud storage solutions, SafeBucket ensures that files never touch your server — uploads and downloads go directly to your S3-compatible storage backend via presigned URLs, while the API handles only metadata, access control, and audit logging.

The platform is built with a security-first, SSO-first mindset. It integrates with any OIDC identity provider for authentication, supports multifactor authentication via TOTP, and enforces role-based access control at both the platform and bucket level. Every sharing action is scoped to buckets with explicit membership rules, and all activity is tracked in real-time audit logs.

SafeBucket's modular architecture allows you to swap out every infrastructure component. Use AWS S3 or self-hosted MinIO for storage, PostgreSQL or SQLite for the database, and NATS or SQS for event handling. It ships with Docker Compose templates for quick local deployment and is actively maintained with signed container images.

Pingvin Share X is a self-hosted file sharing platform forked from Pingvin Share, offering a secure and user-friendly way to share files temporarily. Built with TypeScript and designed for easy Docker deployment, it provides an open-source alternative to commercial services like WeTransfer and Dropbox. Users can upload files and share links with optional expiration, making it ideal for privacy-conscious individuals and teams who prefer to keep their data on their own infrastructure.