Wikipedia has spawned several sister projects. The first, ""In Memoriam: 11 Septemba Wiki"", created in Ọktoba 2002, detailed the 11 Septemba 2001 attacks; this project was closed in Ọktoba 2006. Wiktionary, a dictionary project, was launched in Disemba 2002; Wikiquote, a collection of quotations, a week after Wikimedia launched, and Wikibooks, a collection of collaboratively-written free books, the next month. Wikimedia has since started a number of other projects.