x64dbg Open-Source Debugger

x64dbg is a free and open-source Windows debugger for reverse engineering, malware analysis, and vulnerability research, supporting both 32-bit (x32dbg) and 64-bit (x64dbg) applications. Originally created by Duncan Ogilvie (mrexodia) in 2013 as an open-source alternative to OllyDbg (which was 32-bit only and had been abandoned), x64dbg has become the most popular community-driven debugger for Windows. Key features: built on top of the Debug Engine (TitanEngine by REGroup) and the Disassembler Engine (zydis, formerly BeaEngine), providing robust debugging functionality. Debugging modes: attach to running processes, launch new processes with debugging, or debug child processes. Breakpoints: software (INT3), hardware (DR0-DR3 debug registers, supporting up to 4 hardware breakpoints), memory (access, write, execute on memory ranges), and conditional breakpoints with expressions. Disassembly view with x86/x64 instruction decoding, cross-references, and call graph. Register view with FPU, MMX, SSE, AVX, and debug registers. Memory map showing all committed memory regions with protection flags (read, write, execute). Stack view with call stack backtrace. Hex editor for memory inspection and editing. References view for finding strings, constants, and intermodular calls. Trace recording for code flow analysis and coverage. Conditional tracing for logging specific execution paths. Patches: apply and revert patches to the binary in memory and save patched binary to disk. Plugin SDK: over 200 community plugins extending functionality (ScyllaHide for anti-anti-debugging, xAnalyzer for advanced analysis, Bookmark Manager, Memory Scanner, yara). Scripting via x64dbg scripting language and JavaScript (via plugin). Command-line interface for automated debugging. Symbols and PDB support for debugging with debug symbols. Anti-debug detection bypass. Dynamic analysis of packed and obfuscated malware. GPL-3.0.