Synthfont is described as 'SynthFont is a program for playing midi files using SoundFonts. It can also include VST instruments. Midi input for live playback is also supported' and is an app in the audio & music category. There are more than 25 alternatives to Synthfont for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and BSD. The best alternative is LMMS, which is both free and Open Source. Other great apps like Synthfont are FL Studio, Ardour, AudioTool and Cakewalk.
FL Studio (originally known as FruityLoops) is a full-featured Digital Audio Workstation (DAW) offering a complete range of professional tools for everything from audio editing and beat creation to advanced arrangement, composition, mixing and mastering.
Ardour is a hard disk recorder and digital audio workstation application. It runs on GNU/Linux, Mac OS X, and Windows. Ardour's intention is to provide digital audio workstation software suitable for professional use.
Make music online with a powerful set of tools ranging from synthesizers and samplers to mixers, delays, reverb and much more. AudioTool is an advanced, collaborative DAW (Digital Audio Workstation) built for the browser.
Reason is a virtual studio rack with all the tools and instruments you need to turn your ideas into music. And it's more than just a set of excellent synths and effects. It's a complete music system. Step into the age of Reason.
Bosca Ceoil is all about looping, and designed that way at its heart. Songs are built up from lots of tiny 16 note patterns – the intended workflow is that you loop over these single patterns until you have something you like, then you start making variations.