I compared both in disassembling large exe and its not as fast as diStorm64. Before, Im using olly code but later on used diStorm64 for analysis and patcher/hook.
Its also licensed under BSD License and it supports windows, linux and also mac.
diStorm64 Site - http://www.ragestorm.net/distorm/
diStorm64 is a professional quality open source disassembler library for AMD64, licensed under the BSD license.
diStorm is a binary stream disassembler. It's capable of disassembling 80x86 instructions in 64 bits (AMD64, X86-64) and both in 16 and 32 bits. In addition, it disassembles FPU, MMX, SSE, SSE2, SSE3, SSSE3, SSE4, 3DNow! (w/ extensions), new x86-64 instruction sets, VMX, and AMD's SVM! diStorm was written to decode quickly every instruction as accurately as possible. Robust decoding, while taking special care for valid or unused prefixes, is what makes this disassembler powerful, especially for research. Another benefit that might come in handy is that the module was written as multi-threaded, which means you could disassemble several streams or more simultaneously.
For rapidly use, diStorm is compiled for Python and is easily used in C as well. diStorm was originally written under Windows and ported later to Linux and Mac. The source code is portable and platform independent (supports both little and big endianity).
It also can be used as a ring0 disassembler (tested as a kernel driver using the DDK under Windows)!
