strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
OllyDbg - OllyDbg is a 32-bit assembler level analysing debugger.
ftrace - A function tracer for the Linux kernel.
X64dbg - X64dbg is a debugging software that can debug x64 and x32 applications.
DTrace - DTrace is a performance analysis and troubleshooting tool for Solaris, Mac OS X and FreeBSD.
WinDbg - WinDbg is a multipurposed debugger for Microsoft Windows, distributed on the web by Microsoft as...