The main features of cello-proj/cello are: GitOps And Continuous Delivery.
Open-source alternatives to cello-proj/cello include: akuity/kargo — Application lifecycle orchestration. argoproj/argo-helm. argoproj-labs/argo-rollouts-manager. argoproj-labs/argo-workflows-catalog. argoproj-labs/argocd-agent. adinhodovic/argo-cd-mixin.