Jsonnet is a really excellent one, imo: http://jsonnet.org/ http://jsonnet.org/ There is also Flabbergast, which is comparable but a little less intuitive for

Jsonnet is a really excellent one, imo: http://jsonnet.org/ http://jsonnet.org/ There is also Flabbergast, which is comparable but a little less intuitive for those accustomed to Python-like languages: http://flabbergast.org/ http://flabbergast.org/ The flabbergast homepage has a comparison table that covers most of the things mentioned in this thread: http://flabbergast.org/#comparison http://flabbergast.org/#comparison