OGame.org - Command a fleet. Contains rules, a forum, and screenshots.
OGame Tips - Contains tips and strategies for gameplay. Also has tools, tips for getting started, and a newsletter..
OMarket - Assists with trades. Categorizes by language and universe..
Wikipedia - Contains information on the various languages available as well as general information on the game and its gameplay. Also has screenshots..
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OGame.org - Answers questions and offers a weekly newsletter. [RSS].
- Command a fleet. Contains rules, a forum, and screenshots.