Project SWAMI, Sampled Waveforms And Musical Instruments, is a collection of free software for editing, managing and playing musical instruments for MIDI music composition. Current focus is primarily the SoundFont format, which is an open file format for digital audio “sample” based instruments.
FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has reached widespread distribution. FluidSynth itself does not have a graphical user interface, but due to its powerful API several applications utilize it and it has even found its way onto embedded systems and is used in some mobile apps.
Cross platform support (Linux, macOS and Windows to name a few)
SoundFont 2 support
SoundFont 3 support (vorbis-compressed SF2)
Realtime effect control using SoundFont 2.01 modulators
Playback of MIDI files
Shared library which can be used in other programs