Atkins can be used to examine variables, tables, and linked lists in the running kernel. Subcommands can be entered to show formatted kernel administration of processes, open files, incore inodes, page cache buffers, sockets, etc. Memory dumps can be shown using virtual or physical addresses, or using addresses within user space of a particular process. Furthermore stack backtraces can be printed e.g. to determine the reason why a particular process is currently in a wait- state. Note that atkins requires a certain level of knowledge about the Linux kernel.
PaulOS is a reference implementation of an embedded operating system which supports a subset of POSIX geared for embedded realtime single process applications. It is written to allow applications to be developed under GNU/Linux or FreeBSD and then recompiled without changes for the target architecture. It features POSIX file descriptors, a TCP stack (LwIP) with a BSD socket API, an ANSI C library, a DNS resolver library, and a minimal pthread library. A number of GNU/Linux network applications have been ported to it.
Ulim is a Linux kernel module which enforces resource limits on every process in the system. There are already solutions like pam_limit, but there are some places where the user can execute his programs, but PAM is not used (for example .forward or .procmailrc files, or CGI scripts). Ulim works in the kernel and sets the limits whenever a process changes its real UID, so every process run by a user will have the correct limits.
Fd Linux is a mini floppy distribution of Linux set to fit on 1 floppy disk (kernel and root fs are combined). The sole purpose of this floppy distribution is to provide new Linux users with low-end machines (such as a 386) a very useful set of networking related binaries that can be easily accessed at any time, and which can be used in almost any networked environment (libraries, colleges, offices, small home LANs, dorm rooms, etc.).
The libcomprex library transparently handles automatic compression and decompression of files and archives located locally, online, or even in other compressed archives. The API is similar to C's built-in file access functions, which provides a smooth transition to libcomprex. libcomprex can also open uncompressed files, making it a good replacement for the native file access functions.