https://code.google.com/archive/p/coil/ 

jsonnet
kustomize
ansible templating
helm charts templating
https://github.com/wickman/pystachio type-checked dictionary templating library for python 


https://github.com/purpleidea/mgmt  Next generation distributed, event-driven, parallel config management! 

https://dhall-lang.org/#

ytt  https://carvel.dev/ytt/
https://github.com/carvel-dev/ytt
https://github.com/carvel-dev/starlark-go

OmegaConf - https://omegaconf.readthedocs.io/


Cloud Foundry BOSH  - https://bosh.io/docs/cli-ops-files/