Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.
DebateIsland - DebateIsland.com is a leading online debate platform which uses A.I. to revolutionize online debating. The site features numerous debating formats including Casual, "Persuade Me," Formalish, Formal Traditional Debating, and Lincoln-Douglas Debating.
DebateGraph - Graph visualization of: Join a global community of mappers with over half a million ideas and 30,000 maps. Click on the bubbles to explore, and log-in to create free public & private maps on any topic!
Socratrees - Socratrees outlines arguments into intuitive hierarchies of supporting and opposing statements. This design is loosely based on argumentation theory. However, we do not expect you to be familiar with theory in order to start using Socratrees.
Rationale - Rationale let's you create, online, argument maps.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.