Spinlogs is a shell script for rotating system logs. It is configurable through a text file similar in format and featureset to the newsyslog program in FreeBSD. Any Unix system running ksh should be able to use it. There are many options defining how and when log files should be rotated, and the config file is very straightforward. Rotating log files is a pretty simple task, but some commercial platforms don't include anything better than the old "newsyslog", so this is provided as a system-independent alternative.
ImSafe (Immune Security For your Enterprise) is a host-based intrusion detection tool. After a learning phase, it is able to detect changes in processes behavior, to detect buffer overflows, etc. It is implemented through a device driver (as a kernel patch) for the Linux kernel, but can also be run on other UNIX systems by using a "sensor" built upon strace.
md5mon is a shell script that verifies files by computing their checksums. The script is suitable for use as a basic security checking tool from cron. It features configurable monitoring levels, local copies of find/md5sum, and integrity checks to prevent tampering with itself. It can also use a more secure shasum instead of md5sum.
Secure Syslog is a cryptographically secure system logging tool for UNIX systems. Designed to replace the syslog daemon, ssyslog implements a cryptographic protocol called PEO-1 that allows the remote auditing of system logs. Auditing remains possible even if an intruder gains superuser privileges in the system, the protocol guarantees that the information logged before and during the intrusion process cannot be modified without the auditor (on a remote, trusted host) noticing.
pppctl is a suite of programs suitable for use by those with ppp connections. It includes programs to facilitate charging for use of the connection, controlling the connection from a web page and selecting from a range of ISPs to use to dialup. It's also ideal for doing automated mail/news polls.