glogg

Program: glogg

License: GPL v3 licence
https://github.com/nickbnf/glogg/blob/master/COPYING

Description: 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.

Website: http://glogg.bonnefon.org/
GitHub: https://github.com/nickbnf/glogg
Dev Contact: https://groups.google.com/forum/#!forum/glogg-devel or GitHub

The developer was already asked to make the version of the Portable App, but he replied: "Sure, but can you explain exactly what should be done? I'm not very familiar with Windows ..."
https://github.com/nickbnf/glogg/issues/19
If he does not know how, maybe you will help him?