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Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.. It groups containers that make up an application into logical units for easy management and discovery. Kubernetes builds upon 15 years of experience of running production workloads at Google, combined with best-of-breed ideas and practices from the community.

Rancher enables organizations to easily run containers in production. It is a complete free and open-source software stack for teams adopting containers. With Rancher, you no longer have to build a container services platform from scratch by combining various open source technologies. Rancher addresses the operational and security challenges of managing multiple Kubernetes clusters, while providing DevOps teams with integrated tools for running containerized workloads.

Docker Swarm is a container orcherstration tool based on Docker. With Docker Swarm you can manage multiple containers deployed across multiple host machines. Current versions of Docker includes swarm mode, which allows you to run Docker Engines as swarms. You can manage your Docker Swarm's with the Docker CLI, to create, deploy and manage your Docker Swarm's.

Dokku is a free and open-source project that helps you build and manage the lifecycle of applications. With Dokku developers can setup their own PaaS (Platform-as-a-Service) in a matter of minutes. Dokku provides extra plugins which can be used to manage database, and tools needed for your application. If you need to server your application over HTTPS, Dokku got you covered as well, with the help of Let's Encrypts free TLS certificates.

Heroku is a platform as a service (PaaS) built especially for applications developers. When Heroku first launched in 2007 it was a platform dedicated to deploy and host Ruby applications. Today the offering has broadened and allows developers to launch applications for most languages, frameworks and technologies in a matter of minutes with the help of Heroku Buildpacks. There are currently over 5,400 Heroku Buildpacks in the Heroku Elements Marketplace, that can be used by developers to speed up deployment and saftley host their applications online.

With DigitalOcean App Platform you can build, deploy, and scale apps quickly using a simple, fully managed solution. Deploy code by simply pointing to a GitHub repo and let App Platform do the heavy lifting of managing the infrastructure, app runtimes and dependencies.