Binkd is a TCP/IP daemon which transfers files between two Fidonet systems. It supports so-called "Binkley-Style outbound", also supported by most Fidonet software. It uses its own protocol (called Binkp), but that's not a big problem, as binkd is perhaps the most popular Fidonet-over-IP technology in the former USSR.
BitchX is the premiere IRC (Internet Relay Chat) client. It originally was a modified version of the popular ircII client, and the features were eventually merged into the EPIC IRC client. The current development is aimed at merging the client back to a current branch of EPIC and bringing compatibility and stability back to the client, while bringing the features that are BitchX into a new client.
BrowserExpress is a Web-based e-mail client. BrowserExpress provides a Web browser interface to any mail server, giving all your users Web-based e-mail from any Web browser. The BrowserExpress interface is fully customizable to support your branding, banner advertisements, and language choice. BrowserExpress implements POP3, SMTP, LDAP, and MIME standards.