Terrarium by Fastly Labs. Fastly have been investing heavily in WebAssembly, which makes sense as it provides an excellent option for a sandboxed environment for executing server-side code at the edge of their CDN offering. Terrarium is their “playground for experimenting with edge-side WebAssembly”—it lets you write a program in Rust, C, TypeScript or Wat (WebAssembly text format), compile it to WebAssembly and deploy it to a URL with a single button-click. It’s just a demo for the moment so deployments only persist for 15 minutes, but it’s a fascinating sandbox to play around with.
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