RarMonkey is a simple and quick free expanderthat hardly uses resources and due to this is ideal for low power computers.
Its main handicap is that it only expands files in this format, in comparison with other solutions that cover practically all the compression formats that exist.
But is has in its favor advantages like the integration in the contextual menu of Windows Explorer, the expanssion of various files at the same time, the extraction of multiple files that share the same password and, of course, that fact that it is completely free.
Moreover it has a casual design, transforming the icon of the .rar files associated to the application into the face of an amusing monkey.
RarMonkey focuses in a single compresion format and tries to do it in the best possible way.