Box2DLights is a popular 3rd party library by Kalle Hamalainen that gives you an easy way to setup 2D lighting with shadows in your libgdx game. Kalle’s been maintaining it over the years, some other folks contributed patches. However, as life goes, Kalle no longer has time to maintain it.
With Kalle’s permission, I moved the project from Google Code to Github, fixed up incompatibilities with the latest nightlies, and mavenized it. You can find and contribute to Box2DLights on Github.
Attention: making Box2DLights compatible with the latest libgdx nightlies meant removing GLES 1.x compatibiilty.
Note: the libgdx team is still not going to maintain box2dlights. However, the move to Github will make it very easy for box2dlight users to help maintain it.