Zwiki is a powerful, innovative, user-friendly wiki engine, built on the Zope 2 application server, and released as free software under the GNU GPL . It was actively developed from 1999 to 2009 by Simon Michael and contributors around the world, and has powered many Zope and non-Zope-related wikis. With Zope usage now in decline, Zwiki development has been quiescent since 2010 (and this site is read-only, except for GeneralDiscussion), but Zwiki still works well and questions and contributions are welcome.