GNU Mach is the microkernel upon which a GNU Hurd system is based. It provides an Inter Process Communication (IPC) mechanism which the Hurd uses to define interfaces for implementing in a distributed multi-server fashion the services a traditional operating system kernel provides. Mach is particularly well-suited for SMP and network cluster techniques. Thread support is provided at the kernel level, and the kernel itself takes advantage of that. Network transparency at the IPC level makes resources of the system available across machine boundaries.
Logger is a log queueing and optimization utility. It can completely replace sys/klogd, handle logs larger than 2GB, perform automatic nightly log rotation without affecting services, and transfer logs between machines via TCP connections. Any application that writes a text log can be maintained by Logger. It is light, small, and fast, emphasizes security, and reduces drive usage through memory queueing.
tzls and tzx are commandline utilities for quickly unpacking or listing the contents of various types of common Unix archive files, which may be compressed in any of several ways. The supported compression types are bzip2, gzip, and compress. The supported archive types are tar, cpio, zip, rar, and arj. The tools are implemented as shell scripts, so no compilation is required.
fff and ffl are tools for searching for files and directories from the Unix shell with more integrated "shell-like" behaviour and simpler syntax than find(1), though find(1) is still used to perform the actual searches. In particular, there is no need to quote wildcards, and searches are case-insensitive. Matching results are shown one per line. fff displays full paths, and ffl relative paths. Detailed find(1) options can be appended to the fff/ffl command line if desired. These utilities are based entirely on shell aliases and functions, so no compliation is required.