The Terra Slicer's main tool is the Slicer, which is a tool for slicing Unity Terrain into smaller pieces. Typically, it is used to create smaller slices that when combined, equal the original Terrain, however you can also use the tool to cut out specific regions from a Terrain, discarding regions of the Terrain that you do not need. This is very useful for extracting specific features.
The Terra Slicer product includes some bonus tools and components, the most ueful being the Terrain Tiler component. This component allows you to stitch two or more terrain together so that neighboring heightmaps and alphamaps align along the borders. It can even be used to make a terrain group tileable with itself, meaning the group can be used as an endless repeating world.
The product also includes the Auto Neighbor Setter and Detail Map Drawer components. The former performs neighboring of terrain that are part of the same terrain group at runtime, although this is not that useful given the introduction of Terrain Groups and Auto Connect. The latter allows you to visualize detail maps of Terrain, which can be very useful in some situations.
The product contains some useful commands which are shared with the Streamable Assets Manager. You can find these commands in the Assets Menu via:
Assets/Deep Space Labs/Core/Action
These commands allow you to:
1) Add 1 or more Prefabs from your project hierarchy to the scene.
2) Copy a Project Hierarchy Folder's absolute folder path.
3) Copy a Project Hierarchy Folder's relative folder path.
4) Duplicate 1 or more Terrain.
5) Open the Prefab Creator tool which allows you to convert non prefab game objects to prefabs.