We use a lot of different open source software in the 1A-server and at our data centers.
Below an honorable mention for the open source software which is most important to us:
Proxmox 
SaltStack 
Linux Kernel 
GNU 
Asterisk 
Apache 
Postfix 
ClamAV 
Cyrus 
Squid 
MariaDB 
FreeRADIUS 
Perl 
Python 
PHP 
Laravel 
And many, many others…
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