DietMP3

Reduce audio file sizes while maintaining clear, near-original MP3 sound quality

This app can convert any image or video into any other similar file

Virtual audio mixer that manages audio sources on any device

Amplifies volume on PC programs and audio

Software that manipulates the sound of your voice

An alternative application to Windows Media Player that allows for viewing movies and videos

Simple text-to-speech tool with quirky voice personalities and basic customization, though clearly outdated