Analysis of information sources in references of the Wikipedia article "Second Life" in English language version.
C++: 91.4%
Second Life has two LSL compiles, one which compiles into LSO bytecode and is executed by the simulator in the LSO VM
Mono is now live on the main grid with server version 1.24.3
Second Life has two LSL compiles, ..., the other which compiles to IL and is executed by the simulator in the Mono VM
Luau was the only scripting runtime that fulfilled all of our requirements for a scripting engine within Second Life