Sites and apps similar to Rationale include argunet editor, which is free and open source. Other options are Arguman and DebateGraph. In total there are three sites and apps like Rationale for self-hosting, Mac, Windows and Linux.
Argunet Editor is a free argument map editor for analyzing and visualizing complex debates. You can use it offline and save your debates on your hard-disk. Or you can use it as a client-server application.
Arguman.org is an open source, argument analysis platform where you can create and analyze arguments using logically constructed argument maps in a social environment. Construct your own arguments or add to and voice your support for arguments others construct.
DebateGraph gives you a way to create, explore, and understand individual maps of thought, dialogue, and debate – and the graph of interconnected maps – through a set of complementary and cognitively enhancing visualizations.
