"the Linux Cross Referencer") (running the experimental LXRng fork provided by lxr.linux.no) Linux kernels browsing (ran a very old LXR version until 2017) Glibc 2.3.2 A few other LXRs from the same site (archives only shows directory structure - March 2016) Mozilla Cross Reference, for several projects from Mozilla.org LXR for Apache HTTPD (archive only shows directory structure - March 2016) KDE Cross Reference GNOME Cross Reference (archive not available - March 2016) See also OpenGrok References External links Source code on SourceForge LXRng (fork) Code comprehension tools Code navigation tools Code search engines