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glogg is a multi-platform GUI application to browse and search through long or complex log files. It is designed with programmers and system administrators in mind. glogg can be seen as a graphical, interactive combination of grep and less.

glogg enables you to use regular expressions to search for interesting events in your log files. It presents a results window which, together with complex regular expressions allows easy isolation of the meaningful lines amongst the noise.

glogg has been primarily developed to help spot and understand problems in huge logs generated by embedded systems. It can be equally useful to a sysadmin digging through logs from databases or web servers.

The main design goals for glogg are:

it should be fast
it does not have any limit on the size of files it can handle
it provides a clear view of the matches even in heavily cluttered files.
If you think it does not do that, it is a bug and it should be fixed!

Main features:
Runs on Unix-like systems, Windows and Mac thanks to Qt
Provides a second window showing the result of the current search
Supports grep/egrep like regular expressions
Colorizes the log and the search results
Displays a context view of where in the log the lines of interest are
Is fast and reads the file directly from disk, without loading it into memory
Follows a log that is written to disk in real time
Allow to insert marks in the logs to interesting lines
Supports vim/less like keyboard commands to move around the file
Is open source, released under the GPL