MCU 8051 IDE is a fully featured integrated development enviroment for MCS-51 based microcontrollers. It consists of a compiler, an advanced text editor (with highlighting, validation, and completion), a simulator, a scientific calculator, a hex editor, and many other things. Currently, this program supports only assembly language and a few microcontrollers.
The Perl x86 Disassembler is a full x86 disassembler written in Perl, independent of objdump. The Perl script makes use of the opcode tables from libdisasm [derived from the bastard project] and is distributed as part of libdisasm. This is the same script that is included in the Perl-Disassembler-HOWTO; either the HOWTO or the libdisasm distribution will provide the required files [x86disasm.pl and 1386.opcodes.map] and documentation.
REC is a portable reverse engineering compiler, or decompiler. It reads an executable file and attempts to produce a C-like representation of the code and data used to build it. It can decompile 386, 68k, PowerPC, and MIPS R3000 programs. It recognizes the following file formats: ELF (System V Rel. 4, e.g. Linux, Solaris, etc.), COFF (System V Rel. 3.x, e.g. SCO), PE (Win32 .EXE and .DLL for Microsoft Windows 95 and NT), AOUT (BSD derivatives, e.g. SunOS 4.x), Playstation PS-X (MIPS target only), and raw binary data (via .cmd files).