ATOM is a library for modifying object files.

DTrace is a comprehensive dynamic tracing framework for the Solaris Operating Environment. DTrace provides a powerful infrastructure to permit administrators, developers, and service personnel to concisely answer arbitrary questions about the behavior of the operating system and user programs.

DYMOS is a dynamic modification system.

EEL is a C++ library that hides much of the complexity and system-specific detail of editing executables. EEL provides abstractions that allow a tool to analyze and modify executable programs without being concerned with particular instruction sets, executable file formats, or consequences of deleting existing code and adding foreign code. EEL greatly simplifies the construction of program measurement, protection, translation, and debugging tools. EEL differs from other systems in two major ways: it can edit fully-linked executables, not just object files, and it emphasizes portability across a wide range of systems.

Exokernel is the name of an operating system kernel developed by the Parallel and Distributed Operating Systems group at MIT, and of a class of similar operating systems. An exokernel eliminates the notion that an operating system should provide abstractions on which applications are built. Instead, it concentrates solely on securely multiplexing the raw hardware: from basic hardware primitives, application-level libraries and servers can directly implement traditional operating system abstractions, specialized for appropriateness and speed.

GILK is a dynamic instrumentation tool for the Linux 2.2 kernel.

Ginseng is a dynamic updating system for userspace programs.

K42 is a high performance, open source, general-purpose research operating system kernel for cache-coherent multiprocessors.

KernInst is a framework for dynamically splicing code into a running kernel, almost anywhere, anytime.

Pin is a tool for the dynamic instrumentation of programs. Pin was designed to provide functionality similar to the popular ATOM toolkit for Compaq's Tru64 Unix on Alpha, i.e. arbitrary code (written in C or C++) can be injected at arbitrary places in the executable. Unlike ATOM, Pin does not instrument an executable statically by rewriting it, but rather adds the code dynamically while the executable is running. This also makes it possible to attach Pin to an already running process.

SPIN is an operating system that blurs the distinction between kernels and applications. Applications traditionally live in user-level address spaces, separated from kernel resources and services by an expensive protection boundary. With SPIN, applications can specialize the kernel by dynamically linking new code into the running system. Kernel extensions can add new kernel services, replace default policies, or simply migrate application functionality into the kernel address space. Sensitive kernel interfaces are secured via a restricted linker and the type-safe properties of the Modula-3 programming language. The result is a flexible operating system that helps applications run fast but doesn't crash.