Arm Disassembly [Closed]

What about using objdump?

$ cat add.c 
int add(int a, int b) {
    return a + b;
}

$ arm-linux-gnueabihf-gcc -c -O2 add.c

$ arm-linux-gnueabihf-objdump -d add.o

add.o:     file format elf32-littlearm


Disassembly of section .text:

00000000 <add>:
   0:   1840        adds    r0, r0, r1
   2:   4770        bx  lr

It can provide source code mixing as well if your object file contains debug information (gcc -g) and if you supply -S to objdump.

The Online Disassembler (ODA) supports ARM and a myriad of other architectures. You can enter binary data in the Live View and watch the disassembly appear as you type, or you can upload a file to disassemble. A nice feature of this site is that you can share the link to the disassembly with others.

As you mentioned in your question, IDA Pro can disassemble ARM too.
Besides, have you tried ARM DS-5 Development Studio?
Some features are more hardware-related, but the IDE (Eclipse) is very nice.

Features:

• Debug support for bare-metal, RTOS, Linux, and Android platforms
• Non-intrusive cycle-accurate ETM and PTM instruction tracing
• Seamless support for SMP systems
• Automated debug sessions for faster debug cycles
• ITM and STM instrumentation tracing
• Support for pre-configured and custom platforms

In the manual it says it contains:

• DS-5 Debugger, covering all stages of product development
• ARM Compiler 5.04 for embedded and bare-metal code
• Linaro GCC Toolchain 2013.03 for Linux applications and Linux kernel
• ARM Streamline™ Performance Analyzer for various operating systems, including Linux, Android and RTX
• Eclipse IDE, source code editor and project manager
• Fixed Virtual Platforms (FVP) for Cortex™-A8 and quad-core Cortex-A9 processors
• Example projects and documentation

What about this free program ::