List of Top Free Open Source & Self Hosted Application for File Transfer - Object Storage & File Servers

Object storage is a computer data storage that manages data as objects, as opposed to other storage architectures like file systems which manages data as a file hierarchy, and block storage which manages data as blocks within sectors and tracks.

GarageHQ – An open-source geo-distributed storage service you can self-host to fulfill many needs – S3 compatible. AGPL-3.0 Rust
Minio – Minio is an open source object storage server compatible with Amazon S3 APIs. AGPL-3.0 Go
SeaweedFS – SeaweedFS is an open source distributed file system supporting WebDAV, S3 API, FUSE mount, HDFS, etc, optimized for lots of small files, and easy to add capacity. Apache-2.0 Go
SFTPGo – Flexible, fully featured and highly configurable SFTP server with optional FTP/S and WebDAV support. AGPL-3.0 Go
Zenko CloudServer – Zenko CloudServer, an open-source implementation of a server handling the Amazon S3 protocol. Apache-2.0 Nodejs