Asterisk - An open source telephony switching and private branch exchange service for Linux.

ReliefJet Essentials for Outlook - A large set of useful and easy-to-use tools for every Microsoft Outlook user: Import, export and convert using EML,MSG,TXT and PST formats; remove duplicate items, process attachments and extract addresses; get reports and statistics and even more...

FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.

EML to PST Converter - EML to PST Converter is an ultimate email conversion and migration tool.

Kamailio - Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under...

Cloud Email Conversion - Looking for email migration service? Cloud Email Conversion easily turns the bunch of email files into the Outlook PST file preserving the folders structure