Konqueror is a free and open-source web browser and file manager that provides web access and file-viewer functionality for file systems. It forms a core part of the KDE Software Compilation. Developed by volunteers, Konqueror can run on most Unix-like operating systems
Konqueror is a very robust and powerful web browsing program, but sometimes I think that it’s a bit too robust. For starters, it comes with an IMAP Email client, has a native PDF viewer, and it even has a file manager.