Ansible
A versatile orchestration engine that can automate systems and apps. Instead of a custom scripting language or code, it is very simple and shell based. It is also agent-less, so you can just start using it right away and get things done
linux open-source provisioning config-mgmt orchestration python
argo-cd
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes.
open-source cd virt kubernetes cloud go
Batou
Batou makes it easy to perform automated deployments. It combines Fabric's simplicty and SSH automation, with Puppet's declarative syntax and idempotence
linux open-source provisioning python