REX Game Studios, LLC.
A volumetric-like soft cloud texture add-on for FSX:Steam Edition.
Galactic Voices comes as a free add-on for the MorphVOX Pro Voice Changer.
Flash Voice Buttons is a playback controller built in Flash.
It is dedicated to voice changing and voice manipulation.
Savoia Marchetti SM-79 MVG FSX & P3D is a free addon for FSX and P3D games.
YoGen Software Inc
You can create robotic, alien, funny, or strange voices from normal voices.
Vicky's Cool Softwares
A simple tool which includes Alarm Clock, Reminder and Human voice time teller.
SCS & Samdim Design Group
Tupolev Tu-124 aircraft add-on for FSX-SP2, FSX-Steam, and Prepar3D.
Ivan Jurcaga, Peter Priskin, Kendy Schwarz
FSX & P3D is a scenery add-on for FSX and P3D simulators.
It is a text-to-speech program that reads texts by human voice.
Hear any text in a human voice, or save it as MP3 files for portable players.
Record a human voice and text to speech to audio formats.
DocumentSpeaker can read documents aloud in a human voice.
Add your voice as an extra controller with voice commands that you create.
FSFlyingSchool Pro is a flight instructor add-on for FSX, P3D, and X-Plane.
Precision Manuals Development Group
PMDG 747-400F GE JAL Cargo is an add-on for FSX &FS2004 software.
Mountain qualification flight is a mission add on for FSX.