OllyDbg - OllyDbg is a 32-bit assembler level analysing debugger.
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
WinDbg - WinDbg is a multipurposed debugger for Microsoft Windows, distributed on the web by Microsoft as...
htop - htop - an interactive process viewer for Unix. This is htop, an interactive process viewer for Unix systems. It is a text-mode application (for console or X terminals) and requires ncurses. Latest release: htop 2.
IDA - The best-of-breed binary code analysis tool, an indispensable item in the toolbox of world-class software analysts, reverse engineers, malware analyst and cybersecurity professionals.
ftrace - A function tracer for the Linux kernel.