What strace is for system calls, xtrace is for X11 connections: you hook it between one or more X11 clients and an X server and it prints the requests going from client to server and the replies, events and errors going the other way.

• Development Status: 4 - Beta
• Environment: Console (Text Based), X11 Applications
• Intended Audience: Developers
• License: GNU General Public License (GPL)
• Operating System: POSIX
• Programming Language: C
• Topic: Debuggers, Monitoring