Linux-Based Billing And Business Application Server For FREE use.
...This system can be used from a virtual machine, HDD installation, or a bootable USB drive.
File name = cbs-sfp_v26.09.iso
MD5 = 8136e8cb5815aeccd8fb4398ebf0ab89
SHA1 = c190ffe74d624b6a2554a280082c709daf634790
Videos tutorials are in compressed zip files, or via:
https://www.youtube.com/@apps-and-sec