I found this free open source VST sampler for SFZ, Gigasampler and other formats
This works on Linux, Mac and Windows, with VST, There are some downloads in
this post with a list of features from this website http://www.linuxsampler.org/index.php
Download Debian Linux
The following list shows which features have already been implemented in current Subversion version of LinuxSampler and what is planned to be done in (hopefully) near future. If you are missing something that is not already listed below, you can write a proposal to the developers mailing list , open an "enhancement" request on our bug tracking system or even better send us your patch if you have done something. Even if features are listed to be planned below, it can be that it takes a while until somebody finds the time to implement it. So if you have the time and will to finish one of them, let us know!