This is a massive city (size of New York or SF) with textures, roads, buildings etc... Uses PRO water but can be replaced with the indie water easily for the ones who own the free version of Unity.  

The most flexible and easy to use water. Your only limit is your imagination. Can be applied on any surface animated or not, underwater is working even on non plane surface! Works on any device that supports OpenGL ES 1.1 up to shader 3… Smart Water for all Mobile Phone can be found here.

Earth 3D by Unity3dx is the best Earth/Planetary shader money can buy for a real time 3d engine. It represents hundred of hours of test, and tweaks. You get more than 14 prefabs, 9 different planet scenes, 7 different shaders, scripts, and textures. You also get a 10 pages user manual with description of the [...]

This is an infinite ocean. Started as a community project, several version has been published. This is my version, I published 2 years ago, ported and enhanced for Unity 3.x This pack works with Unity 3.5+ Pro version only are supported the shader uses camera to texture grab for the reflections.

The best game kit for your AAA space game. Includes everything you need to get you started!