Whisper Systems was a company focused on the development of mobile security software, which was acquired by
Twitter in late 2011. Twitter very generously made some of the Whisper Systems software available under an
Open Source license (GPLv3), which has since been under open development by the community. The software has
seen a number of new releases based on that open development, and we’ve been calling the project for this
continued work “Open Whisper Systems.” Welcome to the project’s new home.