Self-hosted alternatives to Amazon S3
Storage is cheap; egress is not, and that asymmetry is the entire business model.
Below are 7 open-source projects that cover the same ground, each scored 0–100 on how actively it is actually maintained — commit volume, release cadence and recent trend. 5 of the 7 are currently rated healthy or better. Ordering reflects that score, not sponsorship.
| Project | Health | Activity (11 mo) | Stars | Licence | Last release |
|---|---|---|---|---|---|
| SeaweedFS SeaweedFS is an open source distributed file system supporting WebDAV, S3 API, FUSE mount, HDFS, etc, optimize | Thriving · 93 | 35k | Apache-2.0 | 14 Sept 2026 | |
| Harbor Cloud native image registry that stores, signs, and scans content. | Healthy · 80 | 29k | Apache-2.0 | 24 Sept 2026 | |
| sftpgo Community Edition Flexible, fully featured and highly configurable SFTP server with optional FTP/S and WebDAV support. | Healthy · 76 | 13k | AGPL-3.0 | 19 Sept 2026 | |
| Zenko CloudServer Implementation of the Amazon S3 protocol on the front-end and backend storage capabilities to multiple clouds, | Healthy · 76 | 2k | Apache-2.0 | 25 Sept 2026 | |
| ZOT OCI Registry A production-ready vendor-neutral OCI-native container image registry. | Healthy · 74 | 2.8k | Apache-2.0 | 6 Sept 2026 | |
| Flare A nonbloated, modern, and highly configurable file/screenshot vault server with support for ShareX, Flameshot, | At risk · 24 | 137 | MIT | 6 Jul 2025 | |
| GarageHQ Geo-distributed, S3‑compatible storage service that can fulfill many needs. | Unrated | — | AGPL-3.0 | — |
How these were picked
Every project listed here is open source and can run entirely on hardware you control. We start from the categories that match Amazon S3's job — File Transfer - Object Storage & File Servers — then rank by health score so that a popular-but-abandoned project never appears above a smaller one that is actively shipping. The scoring method is documented in full.
The scores are recomputed from repository data on every rebuild, so this page reflects the state of these projects as of 1 Oct 2026 — not the day it was written.
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.
Best fit: Environments that need to handle millions of small files while serving them through common object storage and network file system protocols.
Worth knowing: Operating a distributed storage cluster introduces significant operational complexity regarding node management, data replication, and network partitioning.
Harbor
Cloud native image registry that stores, signs, and scans content.
Best fit: It is well-suited for engineering teams running Kubernetes clusters who need centralised, private control over container image lifecycles and security scanning.
Worth knowing: Running a full container registry with integrated scanning and signing involves significant resource overhead and operational complexity compared to simpler storage solutions.
sftpgo Community Edition
Flexible, fully featured and highly configurable SFTP server with optional FTP/S and WebDAV support.
Best fit: Self-hosters who need a dedicated, configurable file transfer endpoint with alternative protocol support for multiple users.
Worth knowing: The software is distributed under the AGPL-3.0 licence, which places copyleft requirements on network services if you modify the code and host it for others. It also carries the operational overhead of managing file access permissions and secure authentication credentials.
Zenko CloudServer
Implementation of the Amazon S3 protocol on the front-end and backend storage capabilities to multiple clouds, including Azure and Google.
Best fit: This is a suitable choice if you need a self-hosted, S3-compliant object storage endpoint for development, testing, or internal applications without relying on external cloud providers.
Worth knowing: You should consider how well it competes with more established S3-compatible alternatives like MinIO regarding performance and community resources. Scaling and maintaining object storage in production also introduces inherent operational overhead for data durability and backup.
ZOT OCI Registry
A production-ready vendor-neutral OCI-native container image registry.
Best fit: It is a suitable choice if you require a dedicated OCI-compliant registry that avoids vendor lock-in for your container infrastructure.
Worth knowing: It overlaps heavily with well-established alternatives like distribution or Harbor, meaning integration documentation and community tooling may be less extensive.