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FDC Open Source/Freeware Library
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Op Audio:

LinPhone – Open source softphone 
X-Lite – Freeware softphone



HMailServer – Open Source email server for Windows
Modoboa – Open Source email server with webmail & calendars for Linux (Debian & Centos)


Chat / Collaboration:

Rocket Chat – Open source chat/email/collaboration server.  Includes web/desktop/mobile applications
Openfire Server – Open source chat/collaboration server
Spark – Open Source chat client
Pidgin – Free chat client
Tawk – Free website messaging app
Crisp – Free website messaging app 


Support / CRM / Office Tools:

osTicket – Open source support ticketing
LibreOffice – Open source Microsoft Office alternative 
SugarCRM – Open source CRM
Trello – Free collaboration tool
ActivePresenter – Screen recording and editing
BigBlueButton – Online web conferencing solution for classroom training



Nagios – IT monitoring and alerting 
pfSense – Open source firewall
Let’s Encrypt – Free and open SSL certificate authority
Guacamole – Open source remote (VNC/RDP/SSH) manager/gateway server
OpenStack – Open source cloud platform
OpenCloud – Open source file sharing


Thank You, Preferred Vendors