Ekiga

Free VoIP and video conferencing solution for seamless online communication and collaboration

Media player compatible with Windows, Android, and OS X

Extreme-quality media player that features extraordinarily crisp audio

Software that manipulates the sound of your voice

Flexible, intuitive audio workstation for recording, mixing, and creating professional-sounding music with virtual instruments

Virtual recording studio with many editing and recording functions

Superb text-to-speech freeware tool that reads any on-screen text