Anyone have more info on this concept of Isolates-as-a-service? (or know of an open source platform that lets you host it, kind of your own lambda but with isol

Anyone have more info on this concept of Isolates-as-a-service? (or know of an open source platform that lets you host it, kind of your own lambda but with isolates?) I'd love to use something like that locally (in our environment) to execute user-generated code in a sandbox away from our code so that we can allow customers to write custom functions.