One way to represent the variability of a product family in Software Product Lines is through Feature Models. To date, the construction of these models remains a complex task as it demands extensive man hours and it is very susceptible to errors. This paper presents a platform for the creation, management and review of feature models called FMxx, which consists of a modeling tool based on a modeling language and a web viewer that offers options for storing and revising models. The results of this work demonstrate that it is possible to work with both modules in parallel (desktops and web), thus having a platform available for students, researchers and experts who wish to model the variability of a product line correctly.