You recently saw a picture of a big hole in space. We now propose you to visualize holes in the ground. As a science directly based on location, Geology makes intensive use of GIS softwares, not only to see boreholes. As a matter of fact, geology needs efficient tools to store, visualize and analyze large datasets of informations in 2D and 3D. We propose a set of opensource softwares based on existing GIS components (QGIS, PostGIS) to answer these problematics. This presentation will detail the different tools developed by Oslandia :  - **Albion** : reconstruct 3D geological model from wells information - **CtrlCraft** : open-pit mines management and optimization - **OpenStope** : underground mine stope editor - and finally a tool to visualize stratigraphic logs and timeseries We will demo their usage and demonstrate how they allow production gains for geologists.