Agora is a Web-based, threaded discussion tool, similar to Usenet newsgroups. Agora remembers each user's preferences, and allows threaded, unread-only browsing. It offers the ability to manage several different groups, with different themes, forums, and administrators for each group. Agora offers a basic Web-based ICQ client, as well as a Web-based notes system.
SimilarReceiver sets up your mailer so that all local non-deliverable mail goes to a helper script. Then it will look at the local userbase to find out if there was just a minor misspelling (e.g. "holga" instead of "holger"). If this is the case, the e-mail goes to this user. Otherwise, it goes to postmaster/gets bounced as usual.
NBFW is a patch for Samba which allows a Samba server which is running on a masquerading firewall to masquerade netbios packets from a private LAN to a public LAN. With NBFW, computers on the private LAN show up in the browselists and can browse the public LAN. With sufficient OS support (such as Linux portfw or natd) it's possible to access the shares of the computers on the private LAN from the public LAN.