WildMIDI is a free open-source software synthesizer which converts MIDI note data into an audio signal using GUS sound patches without need for a GUS patch-compatible soundcard.

WildMIDI, whose aim is to be as small as possible and easily portable,[2] started in December 2001,[3] can act as a virtual MIDI device, capable of receiving MIDI data from any program and transforming it into audio on-the-fly.

[3] WildMIDI was originally conceived in December 2001 as an experiment to see if MIDI files could be played using the same samples as existing software but with less overhead.

After many updates, Chris Ison stopped development in February 2012 with version 0.2.3.5 and has been missing since then.

WildMIDI was forked in 2013 by Bret Curtis who now maintains the project.