Polyhedric Software
WAVmaker
Trial versionRender MIDI files to high-quality WAV files.
WindowsVirtual Sampler SDK
PaidComprehensive Overview of Virtual Sampler SDK
WindowsMIDInight Express
FreeMIDInight Express II: Free MIDI Player with Emulated Wavetables
WindowsAce of WAV
Trial versionAdvanced Sound Editor and Synthesizer
Windows