Discourse is an open source discussion platform built for the next decade of the Internet. A modern forum, everything's been redesigned to be easy.
Kialo is an easy to use, yet powerful tool to engage in thoughtful discussion, understand different points of view, and help with collaborative decision-making.
Loomio is a user-friendly web app that works on computers, smartphones, and tablets. Fast, inclusive, and effective decisions can be your new normal.
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.
This app has been discontinued on October 26th, 2018. Please see the blog entry at the top of the page at http://www.argunet.org/. It says "As a result of this decision, we currently do not plan to release any new Argunet versions." The successor is argdown.org, a markdown-like syntax to auto-generate argument maps.
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.
Get Satisfaction is a community platform that helps companies create engaging customer experiences by fostering online conversations about their products and services at every stage of the lifecycle.
DebateArt.com is a new online platform created with a purpose to give anyone a chance to test themselves in debates on a large number of different subjects and improve argumentation and eloquence skills.
OmniDebate is a platform for climate activists to debate and crowdsource information and sources. You create, vote, and revise posts with your team members. Only the top voted posts are made public on the topic page.
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.