copy is general copy program with features not found in the standard "cp" program. Some of the features are borrowed from the DOS copy command, including a copy and rename, plus append copy. Copy was created to support rsync and mirror local directories while preserving timestamps.
jumpstart is a performance hack for Linux/x86 that runs an application with shared libraries already loaded. The executable file is started, then stopped after the runtime loader has mapped the shared libraries, but before any application code has run. Then the process acts as a server, reading command line arguments and environment via a named pipe, and executing the task in a fork()ed child.
ADTPro transfers disks to and from Apple II and Apple /// computers and the modern world using any of these communications methods: serial/USB, UDP via the Uthernet or LANceGS Ethernet cards, or audio via the Apple's cassette ports. ADTPro has comprehensive bootstrapping support for otherwise diskless Apple IIs. The home page includes extensive tutorials for getting started.
phook is a userspace tool that injects code into any application at run-time using ptrace(). It has a modular design to allow one use different plugins to make the target application do whatever is wanted. Default plugins are able to read and write into file descriptors belonging to other applications and to clean zombie processes.
retty is a utlity that can attach to processes running on another terminal. This is useful, for example, when you run an application locally and then decide you want to use that running application from some remote location. You can run retty on it, do your work, and detach application back again. Its advantage over screen is that you don't have to run the processes on retty in advance.
Partition Logic is a partitioning and disk management tool for PC-compatible computers. It includes its own standalone operating system and GUI, and can fit on a single bootable floppy (or CD). It creates, modifies, resizes, deletes, formats, and moves partitions, and copies hard disks. It is based on the Visopsys operating system.
Unicornscan is an information gathering and correlation engine. It was designed to provide an engine that is scalable, accurate, flexible, and efficient. Unicornscan is an attempt at a user-land distributed TCP/IP stack. It is intended to provide a researcher with a superior interface for introducing a stimulus into and measuring a response from a TCP/IP enabled device or network.
rtldi is an ELF program interpreter that makes it possible for executables to use their own ld-linux.so.2 and libc.so.6 and associated shared libraries, independent of the default versions installed in /lib and any other executable. It facilitates the simultaneous interoperation of programs that were originally linked using different generations of glibc6. In theory it should not be necessary, but in practice glibc6 has not always been backward compatible.
h2incn tries to directly convert C/C++ headers to Nasm-style include files, and can be used in a makefile. It is useful if you want to use the same structures or external variable declarations in C and assembler code, and you don't want to use two separate files and update both each time you change something. It is written in a mix of C and C++ code. It currently works for simple files.
crypt_blowfish is an efficient implementation of a modern password hashing algorithm, based on the Blowfish block cipher, provided via the crypt(3) and a reentrant interface. It is compatible with bcrypt as used in OpenBSD. It is adaptable to future processor performance improvements, allowing you to arbitrarily increase the processing cost of checking a password while still maintaining compatibility with your older password hashes. The hashes it produces are several orders of magnitude stronger than traditional Unix DES-based or FreeBSD-style MD5-based hashes.