SpamAssassin Flagging Milter is a Sendmail milter daemon for Unix systems. It sends email to Spamassassin and then modifies the headers based on the results provided by Spamassassin. It adds a Spam or NonSpam entry in the headers, which client programs can then use to help filter junk. This program is based on another program, milter-spamd: http://www.benzedrine.cx/milter-spamd.html.
FastCPP is an Apache module which implements a C++ Web development environment, and it can be used to develop high-performance Web applications. The Fastcpp program converts Fastcpp scripts to C++ source files by using the mixed syntax of C++ and HTML. These source files are compiled with g++ into a shared library file (.so) which is loaded to call the functions within. FastCPP uses Apache2 MPM's worker.
Rsyslog is an enhanced multi-threaded syslogd. Among others, it offers support for on-demand disk buffering, reliable syslog over TCP, SSL, TLS, and RELP, writing to databases (MySQL, PostgreSQL, Oracle, and many more), email alerting, fully configurable output formats (including high-precision timestamps), the ability to filter on any part of the syslog message, on-the-wire message compression, and the ability to convert text files to syslog. It is a drop-in replacement for stock syslogd and able to work with the same configuration file syntax.