dwarves is a set of tools to inspect the DWARF debugging information inserted in ELF binaries by compilers such as GCC, and which are used by well-known debuggers such as GDB and more recent ones such as systemtap. With pahole, the struct packing and cacheline efficiency can be inspected.
The SimulAVR program is a simulator for the Atmel AVR family of microcontrollers (ATtiny and ATmega). SimulAVR can be used either standalone or as a remote target for avr-gdb. There are interfaces for Python and Tcl. When used in gdbserver mode, the simulator is used as a back-end so that avr-gdb can be used as a source level debugger for AVR programs.
CollectionSpy is a Java profiler that focuses on tracking and analyzing your program's usage of Collection Framework containers. It detects hashing container (e.g. HashMap) corruption due to mutating keys. It tracks expensive internal rehashing of containers whose capacity needs expanding. It detects multithreaded access to any unsynchronized container (e.g. HashMap, ArrayList). It visualizes hashing container bucket list lengths, allowing you to diagnose worst-case access performance.
LMDBG is a collection of small tools for collecting and analyzing the logs of malloc/realloc/memalign/free function calls. Unlike many others, LMDBG does not provide any way to detect overruns of the boundaries of malloc() memory allocations, as this is not the goal. Like most other malloc debuggers, LMDBG allows detecting memory leaks and double frees. However, unlike others, LMDBG generates full stacktraces and separates the logging process from analysis, thus allowing you to analyze an application on a per-module basis.
Galemu is an emulator tool for Generic Array Logic (GAL) and Programmable Array Logic (PAL) chips. It provides a trivial command line tool and an advanced QT4-based graphical user interface. JEDEC fuse maps are supported for configuring the emulated chip. Combinatorial and registered chip configurations are supported.
Arcadia is a Light Integrated Development Environment (IDE) for the Ruby language written in Ruby using the classic Tcl/Tk GUI toolkit. Some features include an editor with source browsing, syntax highlighting, and code completion, debug support, the ability to work on any platform where Ruby and Tcl-Tk work, a highly extensibility architecture, and support for RAD GUI building.
python-ptrace is a debugger using ptrace written in Python. It's able to control multiple processes, read/write bytes, perform breakpoint and step by step execution, use a disassembler, syscall tracer, and parser, explain why a signal is raised, dump registers, stack, and memory mappings, etc.