All 32 or 64 bit Windows versions, from Vista upwards, are supported.
(XP is officially no longer supported but some programs may still work on some XP configurations).
Free SoundFonts
Go here to download some more SoundFonts, including some new ones in the new KompRessed SoundFont (SFKR) format. Also available is the Sonatina Symphonic Orchestra SFZ package compiledby Mattias Westerlund, with samples in OGG format. (SynthFont2 can extract audio from OGG files). Here you can also find the two most common compression programs used: sfArk and sfPack (these cannot extract SFKR).
Go here for a list of sites with more SoundFonts to download.
MidiSoundSynth64 Version 2.2.4.3 - Still FREE, with some restrictions
SyFonOne - based on the SynthFont technology.Download installation package. Go here to read more about it.
VST instruments: VSTSynthFont (3.614, 32 bit and 64 bit), VST3SynthFont (1.014, 64 bit only)
Winamp plugin (1.020) - free for everyone
in_aSyFon - based on the SynthFont technology for use with Winamp (>5). Download the installation package and install the plugin in Winamp's "Plugins" folder
Sf2Patcher (1.100) - the simple SoundFont editor
Sf2Patcher is a simple tool to combine several smaller SoundFonts into one large. It can also be used to update a SoundFont with new presets. Download as ZIP file.
Changes in latest version: - A few bugs fixed. - Support for wide character file names. - A couple of new buttons and features.