Qmail Remove is a utility to help Qmail administrators clean their queues of unwanted or undeliverable mail by defining a search string in the email messages they wish to remove. Options include only reading the first nn bytes, temporarily moving the mail to a "yanked" directory, a reporting-only mode, and more.
QmailInstall sets up a complete email appliance solution based on Qmail. It includes virtual domain handling, a Web interface to manage users in virtual domains, separate mail and system accounts, a POP3 server, Webmail, an IMAP server, relay control, and mailing list software. It is easy to install and configure.
The QmailToaster is an RPM-based Qmail distribution for CentOS, Fedora, SuSE, and Mandriva. This system is designed for ease of deployment and includes strong anti-spam systems. This includes support for SRS, SPF, DomainKeys, and virtual hosting on the SMTP side. On the user side, this has a Web-based administration interface and supports POP3, POP3 over SSL, IMAP, and IMAP over SSL.
QoS Enabled Distributed Objects implements a CCM and adds some more advanced features such as QoS extensions and interoperability with other middleware technologies. Please note that you also need the generator for implementing your own components, and it can be found at the same place.