Voxal - Modify your voice in any application that uses a microphone. From girl to alien, the voice options for online video games, avatars and podcasts are limitless.
VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...
Autotalent - To make music
FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
TiMidity++ - TiMidity++ is an open source MIDI to WAVE converter and player.