Franz is a multi-protocol, unified messaging solution that allows users to access all their chat and messaging services with a single application. It currently supports Slack, WhatsApp, Facebook Messenger, Google Hangouts, Skype, and numerous other services. Within each individual service, Franz supports an unlimited number of separate accounts. Per their website: "you could even use five different Facebook Messenger accounts at once if some inexplicable reason urges you to do so." With the Franz sync feature, users can synchronize their list of services across multiple devices. Starting with version 5 (the current version), the source code for Franz is available on Github under the Apache license. Franz executables are available on the Franz website for Windows, macOS, and Linux.