Boomerang is a decompiler that takes executable files and attempts to create a high level, compilable, possibly even maintainable source file that does the same thing. It does not matter if the executable file has symbols or not, or whether it was compiled using any particular language.
Chump is a table-driven assembler and dissembler with a very fast new architecture input format. Both the assembler and disassembler are created using a single description. It comes with descriptions for ARM, MIPS, Stump, and 6809. It is intended for use as a library compiled with other programs to allow line assembly and disassembly.
Classfile Reader & Writer is a Java package that makes it easy to read and write Java class files. It does not provide any help with displaying the contents of a class file (besides debug output) or disassembe the byte codes, but can read "obfuscated" class files such as those generated by Crema.
Debugtrace is a tool for printing execution traces that are helpful for debugging. It can generate instruction or call traces. It shows every instruction as it is executed, the values of registers that are written, and the memory that is read and written. It uses instrumentation rather than the debugging API, so it is much faster than doing the same thing with gdb. You can customize it to your own debugging needs. The tool works on Linux ARM, IA32, and EM64T.