BGB Silverfish VM
The Silverfish VM is a VM framework project written by Brendan G Bohannon. Its currently main actively supported language is BGBScript.
Note: some information here is outdated/inaccurate. In particular, supporting the Java and C# run-time libraries has ceased being a priority, due partly to a number of complications (on both technical and legal fronts...).
Also, the BGBScript2 ByteCode format is unlikely to be implemented, however, a related bytecode with a vaguely similar packaging (the BGBScriptVM ByteCode) may be implemented. The main change has been a switch to building on top of the VM's typesystem and using a data serialization mechanism, rather than using a dedicated file-format (the data-serialization format retains a similar structure though), but more work is still needed on this front (mostly adding the logic for serializing code blocks and several other VM features).