OllyDbg - OllyDbg is a 32-bit assembler level analysing debugger.
perf - Perf is a simple app monitoring solution paired with meaningful alerts.
X64dbg - X64dbg is a debugging software that can debug x64 and x32 applications.
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Immunity Debugger - Immunity Debugger is a powerful new way to write exploits, analyze malware, and reverse engineer...
DTrace - DTrace is a performance analysis and troubleshooting tool for Solaris, Mac OS X and FreeBSD.