Simplify the following text for a Grade 9 native English-speaking person.
Original: Wikibooks ( previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks ) is a Wiki hosted by the Wikimedia Foundation for the creation of free content textbooks and annotated texts that anyone can edit .
Simplified: Wikibooks ( previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks ) is a collection of free books . It is one of many projects that are run by the Wikimedia Foundation .