Hi @raizam, thank you for the interest
The engine is an Entity-Component-System based engine that basically implements scene hierarchy, basic optimizations (like octree culling and bounding-box / sphere based culling), components for all basic functionality and things like materials, skinned animation etc.
In addition its integrated with Bullet3d so physics are easy to add.
Some more info here http://community.monogame.net/t/geonbit-engine-first-release/9424/2
It still very new so expect some changes etc. Also it doesn't supported deferred lighting yet, if that's a problem. But it provides a lot of useful stuff out of the box.