Here is a place where you can see huge procedurally generated worlds with correct spherical geometry. These worlds have the following features:

• the flexible configuration of world generation parameters
• custom outlines of the continents
• the full-fledged river system with z-coordinate, and highland lakes
• biomes with the placement dependent on longitude, latitude, and altitude
• the gradual transition of biomes is achieved by the mutual penetration of their parts (yin-yang boundary)
• technology of noise generation (fBm) on a triangular domain
• vector data which define the relief features (continent and lake boundaries, biome boundaries, rivers, height contours, tiles and sectors, etc.);
• data are instantly suited for existing Geographic Information System (GIS) software;

Sample planets

Owl. This planet is maximally similar to Earth (how this is possible at the present time). Owl planet’s page with data x3d model with texture (5-30 sec to load)

Mini2. The first planet whose continents span the planet dateline. There is “zones” method of global biomes creation. The planet’s page with data x3d model with texture (5-30 sec to load)

For more info see Creation blog.

Change Log is the info about project updates.

List of all planets can be found here.