Geheimnis is no longer maintained (use of kpgp is now recommended). Geheimnis was an application for UNIX/KDE that "wraped" around encryption programs and their irksome command-line interface, making it easier for users to use these programs.
MIME Defanger is a flexible MIME e-mail scanner designed to protect Windows clients from viruses. It can alter or delete various parts of a MIME message according to a very flexible configuration file. It can also bounce messages with unnaceptable attachments. MIME Defanger works with Sendmail 8.10's new "Milter" API, which gives it much more flexibility than procmail-based approaches.
SteGUI is a graphical front-end to Steghide. It lets users view the images and play the sounds that Steghide allows as cover files, and command the program all with one tool. It also embeds a simple text editor to manage text payload files.
Spamhammerd to demon dynamicznej czarnej listy dla Postfiksa. Obserwuje klientów generujących powtarzające się błędy i dodaje ich do czarnej listy po ustawialnym odstępie czasu. Jest ekstremalnie efektywny na dużych klastrach SMTP.