Those assets are all available on the Unity 3D Assets Store and require Unity3D Editor to work.

Map Extractor: extracts 2D maps from Google Map, Bing Mapand Open Street Map

Absolute Terrain Combiner: helps you create and customize multiple terrain grid while keeping control on performances and optimization.

Glaz Underwater FX: contains a collection of underwater effects used to create Glaz Underwater VR experience.

Absolute Mesh Combiner: optimizes your 3D models to reduce the draw calls of your scene. It is easy to use as you only have to drag and drop a script and press the Optimize button to process