The best alternatives to KubeDB are Control, Periscope Data, and LastBackend. If these 3 options don't work for you, we've listed a few more alternatives below.
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LastBackend is a whole ecosystem of products and it allows, not only to manage containers similarly to Kubernetes but also collect their images on github/bitbucket/gitlab from the source code. It also contains a whole complex of infrastructural services designed to speed up developing, testing and deploying releases.
Klate Platform is a fully managed production-grade environment based on Kubernetes on top of secure cloud infrastructure. It has all the necessary components pre-installed so that you can deploy your Kubernetes based apps and services instantaneously.