(http://splot-research.org) is a set of research-oriented online tools for Software Product Lines (SPL) practitioners.
S.P.L.O.T's source code (as well as its main library SPLAR) are freely available on GitHub and have been successfully extended by others to address different research needs.
offers an analysis tool that can help practitioners to analyse and reason on feature models.
This task can be tedious and time-consuming, especially in large scale, given that constraints in the feature model might prevent configuration actions.
Many other tools are available to support Software Product Lines including FaMa, FeatureIDE, Pure::Variants, Ahead, and others.