GML2LGF converter converts traditional GML files into Lemon Graph Format that can be used by the LEMON Graph Library. This library is very useful especially for the researchers of the field of Computer Science, who may want to analyze generated or real-world network topologies described in GML language by the effective C++/LEMON library. Therefore, this app enables them to convert such gml files into lgf files in a very fine-grained and customizable manner.