The following is a list of popular SpongeBob SquarePants fansites.
Encyclopedia SpongeBobia is a SpongeBob SquarePants knowledge base with information on characters, episodes, and everything else related to the show.
Fanonia SpongeBobia is a wiki that began as a fanfiction-based website but recently shifted to more broader aspects of the SpongeBob fan community.
SpongeBob Fanon Wiki
The SpongeBob Fanon Wiki is a SpongeBob SquarePants fansite where users can create their own spin-offs, episodes, and other fanmade content for other users to read and review. It is currently the second largest SpongeBob wiki after Encyclopedia SpongeBobia.
SpongeBob Community Forums
The SpongeBob Community Forums are where users can not only discuss SpongeBob but also talk about various other non-SpongeBob things. The SBC Forums also hold yearly events like Octerror Fest and March Madness.
SpongeBuddy Mania is a SpongeBob fansite created from a merger of SpongeBob Mania and SpongeBuddy. SpongeBuddy Mania, like Encyclopedia SpongeBobia, contains episode transcripts and character biographies, and like the SpongeBob Community, has a forum.
Sarah's SpongeBob SquarePants Shrine
Sarah's SpongeBob SquarePants Shrine was a SpongeBob SquarePants fansite that was started prior to 2003 and served as a resource to SpongeBob SquarePants fans. The traces of the former fansite have been archived into SpongeBuddy Mania.
SpongePedia is a wiki that aims to provide abundant information on the SpongeBob SquarePants series. It contains news about anything to do with the SpongeBob real world or site, or under the little town of Bikini Bottom. Due to attempts from spambots to take over SpongePedia, account creation has been disabled indefinitely.