[AgentME]

While some of those were open standards, most/all of those only ever had a single implementation each. JVM's startup time is painful, and its sandboxing abilities have been frequently broken. Wasn't Microsoft p-code interpreted, or are you referring to something else? NaCL was still architecture-specific until PNaCL. PNaCL is pretty comparable to WebAssembly besides that PNaCL was driven by Google alone, and WebAssembly was worked on by many players after it evolved from asm.js.

[seanmcdirmid]

> most/all of those only ever had a single implementation each.

At its peak, there were many different vendors delivering JVM implementations. How we forget Kaffe, even.

[pjmlp]

There are still quite a few JVM implementations still, they just tend to be specialized in embedded, military or factory automation systems.