Besides Docker and Kubernetes there are many other open source tools in "containers ecosystem".
This podcast interview explains many of them... Helm, Helm Charts, Draft, Brigade...
Container Native Development with Ralph Squillace – Software Engineering Daily
Helm - The Kubernetes Package Manager
kubernetes/helm: The Kubernetes Package Manager @ GitHub
kubernetes/charts: Curated applications for Kubernetes @ GitHub
Azure/brigade: Event-based Scripting for Kubernetes. @ GitHub
Introducing Brigade: event-driven scripting for Kubernetes
Azure/draft: A tool for developers to create cloud-native applications on Kubernetes @ GitHub