gdb

• Intro

the GNU debugger

lldb

the LLVM project's debugger

rr

• records program state over time
• replay & debug same recording many times
• reverse execution
• chaos mode for catching intermittent bugs
• claims to be faster and more memory efficient than gdb

WinDbg

does also provide record & replay debugging like rr (here called time travel debugging)

cgdb

• Example Session

• runs in the command line
• split screen with source code window
• shows break points and current instruction
• install on Ubuntu/Debian/WSL: sudo apt-get install -y cgdb

gdbgui

• browser-based frontend for gdb
• install via pip: sudo pip install gdbgui

DDD

• official GNU debugger frontend
• The UI is a bit old-fashioned, but it is actually quite usable if you spend some time with it.
• install on Ubuntu/Debian/WSL: sudo apt-get install -y ddd

WinGDB

debugging with GDB in Microsoft Visual Studio

Online GDB