iRedMail
iRedMail is A ZERO COST, fully fledged, full-featured mail server solution. All used packages are free and open source, provided by the Linux/BSD distribution venders you trust. it is an open source project, released under GPLv2
C is a general-purpose programming language and it is one of the most widely used programming languages of all time.
Seafile
Seafile enables you to build private cloud for file sharing and collaboration among team members in your company/organization. First you create a file library in the web and upload files to it. Then you share it into a team or with another user.
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