Portus is described as 'Open source authorization service and user interface for the next generation Docker Registry' and is an app in the development category. There are six alternatives to Portus for a variety of platforms, including Web-based, Self-Hosted, Linux, SaaS and Docker apps. The best Portus alternative is Docker Hub, which is free. Other great apps like Portus are Harbor, Google Container Registry, 8gears Container Registry and Unregistry.
Docker Hub is a cloud-based registry service which allows you to link to code repositories, build your images and test them, stores manually pushed images, and links to Docker Cloud so you can deploy images to your hosts.
Harbor is an open source trusted cloud native registry project that stores, signs, and scans content. Harbor extends the open source Docker Distribution by adding the functionalities usually required by users such as security, identity and management.
The 8gears Container Registry is a Harbor-based container registry, offered and operated by the CNCF project's maintainer and contributors. Container image management for teams and software vendors who want to distribute containers instead. Unlimited private repositories for individuals.
Unregistry is a lightweight container image registry that stores and serves images directly from your Docker daemon's storage.
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