Back in the day, computers had no build-in reliable way of generating entropy data (random numbers). These programs filled that gap by producing (aed, ved, te) and distributing (entropybroker) those numbers.

audio entropy daemon   aed - produce entropy from audio (from an alsa device)

video entropy daemon   ved - produce entropy from video (from a video4linux device)

timer entropy daemon   te - produce entropy by comparing timers

entropy broker   entropybroker - distribute (securily) entropy data from and to systems

For contact info, see this page.