WebFig is a web based RouterOS utility which allows you to monitor, configure and troubleshoot the router. It is designed as an alternative of WinBox, both have similar layouts and both have access to almost any feature of RouterOS.
WebFig is accessible directly from the router which means that there is no need to install additional software (except web browser with JavaScript support, of course).
As Webfig is platform independent, it can be used to configure router directly from various mobile devices without need of a software developed for specific platform.