x64dbg is a powerful open source x64/x32 debugger for Windows.

Features:

• Analysis
• Basic debug symbol (PDB) support
• Built-in assembler (XEDParse/Keystone/asmjit)
• C-like expression parser
• Content-sensitive register view
• Decompiler (Snowman)
• Dynamic stack view
• Dynamically recognize modules and strings
• Executable patching
• Extendable, debuggable scripting language for automation
• Fast disassembler (Capstone)
• Full-featured debugging of DLL and EXE files (TitanEngine)
• Fully customizable color scheme
• IDA-like instruction token highlighter (highlight registers, etc.)
• IDA-like sidebar with jump arrows
• Import reconstructor integrated (Scylla)
• Intuitive and familiar, yet new user interface
• Memory map
• Multi-datatype memory dump
• Plugin support with growing API
• Source code view
• Symbol view
• Thread view
• User database (JSON) for comments, labels, bookmarks, etc.
• Yara Pattern Matching