I have tried Viable and it's my top pick out of them all. It's got pretty much all the features of Vrapper, but some additional features that none of the others have like window splitting, command history, and external filters and commands.
It is pay, but it's free to try. It does lack some of the basics like Pierre mentioned, no support for Ctrl+] for example, however the development is active so chances are it will be implemented.
