Open Source File Sync&Share and Document Collaboration Platform
Seafile is an open source file sync and share platform, focusing on reliability and performance. Seafile's built-in collaborative document SeaDoc, make it easy for collaborative writing and publishing documents.
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Sleek, modular open source JavaScript file uploader
Uppy is a sleek, modular JavaScript file uploader that integrates seamlessly with any application. It’s fast, has a comprehensible API and lets you worry about more important problems than building a file uploader.
Uppy fetches files locally and from remote places like Dropbox or Instagram. With its seamless integration, reliability and ease of use, Uppy is truly your best friend in file uploading.
Free Cloud Encryption for Dropbox & Co.
Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud.
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Rclone is a command-line program to manage files on cloud storage. It is a feature-rich alternative to cloud vendors' web storage interfaces. Over 40 cloud storage products support rclone including S3 object stores, business & consumer file storage services, as well as standard transfer protocols.
CryFS encrypts your files, so you can safely store them anywhere. It works well together with cloud services like Dropbox, iCloud, OneDrive and others.
Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.
PEPS is an email, file sharing and collaboration server that intends to fullfil the need for high-quality on-premises software that could rival with top-notch SaaS products such as Gmail or Dropbox, and innovate with new features.
CloudTunes provides a unified interface for music stored in the cloud (YouTube, Dropbox, etc.) and integrates with Last.fm, Facebook, and Musicbrainz for metadata, discovery, and social experience. It is similar to services like Spotify, except instead of local tracks and the fixed Spotify catalog, CloudTunes uses your files stored in Dropbox and music videos on YouTube.
ownCloud is open source software, built by a vibrant community of people like you!
dvcs-autosync is a project to create an open source replacement for Dropbox/Wuala/Box.net/etc. based on distributed version control systems (DVCS). It offers nearly instantaneous mutual updates when a file is added or changed on one side but with the added benefit of (local, distributed) versioning and that it does not rely on a centralized service provider, but can be used with any DVCS hosting option including a completely separate server - your data remains your own.