ownCloud gives you universal access to your files through a web interface or WebDAV. It also provides a platform to easily view & sync your contacts, calendars and bookmarks across all your devices and enables basic editing right on the web. Installation has minimal server requirements, doesn’t need special permissions and is quick. ownCloud is extendable via a simple but powerful API for applications and plugins.

ownCloud - A personal cloud which runs on your own server

Minio is an object storage server, It is compatible with Amazon S3 cloud storage service. It is best suited for storing unstructured data such as photos, videos, log files, backups and container / VM images. Size of an object can range from a few KBs to a maximum of 5TB. Minio server is light enough to be bundled with the application stack, similar to NodeJS, Redis and MySQL.
 
MinIO is different in that it was designed from its inception to be the standard in private cloud object storage. Because MinIO is purpose-built to serve only objects, a single-layer architecture achieves all of the necessary functionality without compromise. The result is a cloud-native object server that is simultaneously performant, scalable and lightweight.
 
While MinIO excels at traditional object storage use cases like secondary storage, disaster recovery and archiving, it is unique at overcoming the private cloud challenges associated with machine learning, analytics and cloud-native application workloads.

Minio is an object storage server, It is compatible with Amazon S3 cloud storage service. It is best suited for storing unstructured data such as photos, videos, log files, backups and container / VM images. Size of an object can range from a few KBs to a maximum of 5TB. Minio server is light enough to be bundled with the application stack, similar to NodeJS, Redis and MySQL.

Minio - Open source object storage server compatible with Amazon S3 APIs

Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud. Most cloud providers encrypt data only during transmission or they keep the keys for decryption for themselves. These keys can be stolen, copied, or misused. With Cryptomator, the key to your data is in your hands. Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to your favorite cloud service.
 
It works with Dropbox, Google Drive, OneDrive, MEGA, pCloud, ownCloud, Nextcloud and any other cloud storage service which synchronizes with a local directory. It uses AES encryption with 256-bit key length.

Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud. Most cloud providers encrypt data only during transmission or they keep the keys for decryption for themselves. These keys can be stolen, copied, or misused. With Cryptomator, the key to your data is in your hands. Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to your favorite cloud service.



Cryptomator - Multi-platform transparent client-side encryption of your files in the cloud

Sia is a new decentralized cloud storage platform that radically alters the landscape of cloud storage. By leveraging smart contracts, client-side encryption, and sophisticated redundancy (via Reed-Solomon codes), Sia allows users to safely store their data with hosts that they do not know or trust. The result is a cloud storage marketplace where hosts compete to offer the best service at the lowest price. And since there is no barrier to entry for hosts, anyone with spare storage capacity can join the network and start making money.
 
 Sia splits apart, encrypts, and distributes your files across a decentralized network. Since you hold the keys, you own your data. No outside company can access or control your files, unlike traditional cloud storage providers.

Sia is a new decentralized cloud storage platform that radically alters the landscape of cloud storage. By leveraging smart contracts, client-side encryption, and sophisticated redundancy (via Reed-Solomon codes), Sia allows users to safely store their data with hosts that they do not know or trust. The result is a cloud storage marketplace where hosts compete to offer the best service at the lowest price. And since there is no barrier to entry for hosts, anyone with spare storage capacity can join the network and start making money.

Sia - Your decentralized private cloud

Rclone ("rsync for cloud storage") is a command line program to sync files and directories to and from different cloud storage providers like Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Yandex.

Rclone - rsync for cloud storage like Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Yandex Files 

Perkeep (née Camlistore) is a set of open source formats, protocols, and software for modeling, storing, searching, sharing and synchronizing data in the post-PC era. Data may be files or objects, tweets or 5TB videos, and you can access it via a phone, browser or FUSE filesystem. Perkeep can store files like a traditional filesystem (think: “directories”, “files”, “filenames”), it’s specialized in storing higher-level objects, which can represent anything.

Perkeep - Personal storage system for life: a way of storing, syncing, sharing, modelling and backing up content

CloudServer (formerly S3 Server) is an open-source Amazon S3-compatible object storage server that is part of Zenko, Scality’s Open Source Multi-Cloud Data Controller.CloudServer provides a single AWS S3 API interface to access multiple backend data storage both on-premise or public in the cloud.
 
CloudServer is useful for Developers, either to run as part of a continous integration test environment to emulate the AWS S3 service locally or as an abstraction layer to develop object storage enabled application on the go.

CloudServer (formerly S3 Server) is an open-source Amazon S3-compatible object storage server that is part of Zenko, Scality’s Open Source Multi-Cloud Data Controller.CloudServer provides a single AWS S3 API interface to access multiple backend data storage both on-premise or public in the cloud. 

S3 - Node.js implementation of a server handling the Amazon S3 protocol

MyDrive is an Open Source Cloud Server (Similar To Google Drive), the service uses mongoDB to store file/folder metadata, and supports multiple databases to store the file chunks, such as Amazon S3, the Filesystem, or just MongoDB. MyDrive is built using Node.js, and Typescript. The service now even supports Docker images!

MyDrive - Open Source Cloud Server (Similar To Google Drive)

Lychee is a easy to use and great looking photo-management-system you can run on your server, to manage and share photos. Lychee comes with everything you need and all your photos are stored securely.

Lychee - A great looking and easy-to-use photo-management-system you can run on your server, to manage and share photo

Seafile is an open source cloud storage system with privacy protection and teamwork features. Collections of files are called libraries. Each library can be synced separately. A library can also be encrypted with a user chosen password. Seafile also allows users to create groups and easily sharing files into groups.
 
Seafile's version control model is similar to Git, but it is simplified for automatic synchronization. Each Seafile library behaves like a Git repository. It has its own unique history, which consists of a list of commits. A commit points to the root of a file system snapshot. The snapshot consists of directories and files. Files are further divided into blocks for more efficient network transfer and storage usage. However, Seafile doesn't rely on Git to run.

Seafile is an open source cloud storage system with privacy protection and teamwork features. Collections of files are called libraries. Each library can be synced separately. A library can also be encrypted with a user chosen password. Seafile also allows users to create groups and easily sharing files into groups.

Seafile - A file syncing and collaboration platform for teams.

Parsec can easily share your work and data in the cloud in a total privacy. It works as a virtual drive on you computer. You can access and modify all the data stored in Parsec with your regular softwares just like you would on your local hard-drive.

Parsec - Dropbox-like file sharing with full client encryption 

CrypTag is an idea, a spec, an API, and a piece of software that makes it easy to build a zero-knowledge system, which means that the server holding user data doesn't know what it is (since it's encrypted).
 
It is meant as a primitive to be used to build more sophisticated systems that would rather not re-implement the pieces necessary to build a zero-knowledge system, but several useful command line applications have been built with it so far, namely cput (for encrypting/saving files), cget (for fetching/decrypting files), and cpass (CryptPass, a password manager).

CrypTag is an idea, a spec, an API, and a piece of software that makes it easy to build a zero-knowledge system, which means that the server holding user data doesn't know what it is (since it's encrypted).

Cryptag - Encrypted, taggable, searchable cloud storage

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