The main goal of the Obfuscar Mapping Parser is parsing Obfuscar's output (original-obfuscated mapping files) and deobfuscationg stacktraces created from obfuscated applications. The application shows items tree built from mapping file and allows exploring and searching items there by their obfuscated names.
Main use case: when you have a .NET application, obfuscated by the Obfuscar and have a crashlog with the stacktrace - you can easily deobfuscate it to get stacktrace in the original source code.
Google founds no software for such rare purpose. There are a lot of links to the Obfuscar itself (and it's good) and nothing for its mapping files except the configuration of the Obfuscar to produce them.