Plot Factory - Online story planner, organizer, and writing application.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Anchor CMS - Free and lightweight blogging system
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Textpattern - Textpattern is an elegant content management system that is free, open source software.