Geoscience for QGIS is a free plugin that adds drill hole and other geoscience tools to QGIS. With it you can:
- Desurvey drill holes
- Display downhole data in plan and on sections
- Convert downhole structural measurements to dip and dip direction
- Create local grid coordinate systems
- Stream your QGIS map into Spatial Integration
- Make white or black transparent on raster images
Install Geoscience for QGIS from Plugins > Manage and Install Plugins in QGIS. Its commands are on the Geoscience menu and toolbar. Choose Geoscience > Help to open these pages.
Want to see your drill holes in full 3D? Give Spatial Integration a try as well.