bibisco - bibisco is a novel writing software.
Dabble Writer - Writing software for novelists.
Manuskript - Open-source tool for writers.
Novlr - Online word processor and organizer for novel writing.
WriteFreely - Write Freely is free and open source software for starting a minimalist, federated blog — or an entire community.
Nulis - Tree editor for writers, makes outlining your stories and articles easy, fun, and convenient.