x64dbg

x64dbg is a 64-bit assembler-level debugger for Windows. The corresponding 32-bit debugger is called x32dbg.

Key features:

• Open-source
• Intuitive and familiar, yet new user interface
• C-like expression parser
• Full-featured debugging of DLL and EXE files (TitanEngine)
• IDA-like sidebar with jump arrows
• IDA-like instruction token highlighter (highlight registers etc.)
• Memory map
• Symbol view
• Thread view
• Content-sensitive register view
• Fully customizable color scheme
• Dynamically recognize modules and strings
• Import reconstructor integrated (Scylla)
• Fast disassembler (BeaEngine)
• User database (JSON) for comments, labels, bookmarks etc.
• Plugin support with growing API
• Extendable, debuggable scripting language for automation
• Multi-datatype memory dump
• Basic debug symbol (PDB) support
• Dynamic stack view
• Built-in assembler (XEDParse)
• View your patches and save them to disk
• Built-in hex editor
• Find patterns in memory