Zimbra Collaboration is an open, secure collaboration server for email, calendaring, file sharing, tasks and more. Slack’s ambition to become the default, go-to place for employees chat to each other and link into hundreds of. an application package that’s available across a range of open-source-based Linux environments. This opens the app. Google has released a highly-requested Gmail feature for Linux users: video and voice chat. Ubuntu and other Debian-based Linux…