Polyphone is a free tool for editing soundfonts in format sf2.
Main features:
- support for sf2 (including 16- or 24-bit samples) and sfArk formats.
- sf3, sfz import / export.
- support for jack and asio audio servers.
- built-in synthesizer, controlled by a virtual keyboard or midi signals.
- analysis of frequency peaks and estimation of sample pitch.
I'm looking forward to trying this. I was into creating Soundfonts back in the 90s using my Soundblaster AWE32 & Vienne. I hope it's as easy to use.