Awesome

soundfont-player-cs

It is an experimental SoundFont player based on nfluidsynth, NAudio, and xwt.

It is intended to easily find instruments, namely drum kits, across multiple soundfont files.

Since Xwt lacks a lot of features and no one is serious about Gtk3 desktop, I might quickly give up and switch to new codebase in different frameworks or even different languages.