Entropia Universe Official Website:

Entropia Universe – The official Entropia Universe website

Entropia Forums and Community Oriented Websites:

Entropia Universe Official Forums – The official Entropia Forum.
Entropia Gateway – A community of Entropia Universe players.
Entropia Universe Chronicle – Another community of Entropia Universe players.

Entropia Universe Knowledge Base Websites:

Zap’s Loot Table – Discover which mobs drop which loots here.
Entropia Directory – Entropia Universe wiki.
How to make money in Entropia – A guide in the Entropia forum on making money in Entropia.
Entropia Newbie Guide – A guide for noobs on Entropia.
Entropia Stratics – Opening soon, another Stratics website.