yoshimi is described as 'Yoshimi is a software synthesizer for Linux based on the 2.4.0 release of ZynAddSubFX, written by Nasca Octavian Paul. Yoshimi delivers the same synth capabilities, along with very good Jack and Alsa midi/audio functionality' and is an app in the Audio & Music category. There are four alternatives to yoshimi for Linux, Windows, Mac, BSD and DSSI. The best alternative is FluidSynth, which is both free and Open Source. Other great apps like yoshimi are ZynAddSubFX (Freemium, Open Source), WhySynth (Free, Open Source) and GiMeSpace TouchSpace Synth (Paid).
ZynAddSubFX is a fully featured open source software synthesizer capable of making a countless number of instruments, from some common heard from expensive hardware to interesting sounds that you'll boost to an amazing universe of sounds.
This program was created to make playing music on a computer more intuitive and affordable for anyone who wants to make music. It offers the most natural way to make music by simply using your touch screen or your hand in front of the web cam.