Profiling Viewer is described as 'opens and visualizes callgrind files. You can use Treemap, Callgraph, flat or hierarchic lists to identify functions where your application spends more time than expected' and is an app in the Development category. There are three alternatives to Profiling Viewer for Linux, Online / Web-based and Windows. The best alternative is Kcachegrind, which is both free and Open Source. Other great apps like Profiling Viewer are Webgrind (Free, Open Source) and WinCacheGrind (Free, Open Source).
Webgrind is an Xdebug profiling web frontend in PHP5. It implements a subset of the features of kcachegrind and installs in seconds and works on all platforms. Features Super simple, cross platform installation.