This project is about Debian packaging related to BBBS, which is a complete BBS package with WWW/InterNet/modem/ISDN/LAN based access modes; see the BBBS home page for more details regarding the application itself.
The installer package bbbs-installer downloads the archive from the www.bbbs.net web site, or uses the one in the tmp directory if already present, then installs the application to the system.
The package bbbs-equivs is for when you have manually installed BBBS and would like to make it like a standard Debian installed package.