Wire

Wire is an end-to-end encrypted messaging and collaboration platform developed by Wire Swiss GmbH, with operations now based in Berlin, Germany after relocating back from the US. It provides encrypted text, voice and video calls, conference calls, file sharing, screen sharing and guest rooms for external collaboration, all secured with the Proteus protocol and available on iOS, Android, Windows, macOS, Linux and the web. The Personal tier is free; Wire Pro, Enterprise and Red are sold by subscription to businesses, regulated industries and crisis-response teams. The clients are open source under AGPL/GPL.