Mac's Thinktank

Users submit innovative solutions to the world's problems.
http://www.geocities.com/Athens/Crete/7099/

Peoples Forum

Free discussion on any topic. Users can post under author names of their own choosing.
http://peoplesforum.com/

Space Colonization Foundation

Discussion on space travel, colonization, and the survival of humanity.
http://pub3.ezboard.com/fspacecolonizationfoundationthesurvivalofthespecies/

If I am...

Members discuss what they would do were they a doctor, a politician, a rocket scientist, and a porn star. Users must select a username and password before posting a new message.
http://www.ifiam.com/

Opinionator

Forums, articles, and links to publications about a variety of issues.
http://www.opinionator.net

Time Bomb 2000

Contains discussions on the end of the world. Free registration required to participate.
http://www.timebomb2000.com/vb/forumdisplay.php?s=e56a81167f03b171a63a741aa06d5185&forumid=9

Nutz Refugees

Made for general topics, entertainment, and jokes.
http://pub90.ezboard.com/bnutzrefugees/

EZ Board: Free Speech USA

A message board on all issues.
http://pub89.ezboard.com/bfreespeechusa/

A Question of Debate

Holds discussions on any subject. No registration needed.
http://www.geocities.com/fourquater/

EZ Board: Free For All

A board for any topic. Users choose a username, but need not choose a password, to post new discussions or reply to existing ones.
http://pub88.ezboard.com/bfreeforall24967/

Net Citizen

A citizen-contribution site open to anyone, for the pupose of discussing political issues both local and global and expressing opinions through poetry, art, and cartoons.
http://www.netcitizen.org/

Global Ideas Bank

A suggestion box for socially innovative non-technological ideas and projects, with £1,000 UK sterling awards annually for the best ideas or projects submitted.
http://www.globalideasbank.org/

Keep It Real

Discussion on current affairs and issues from a realist perspective.
http://pub16.ezboard.com/frealismfrm5/

Nattie's Speak Your Mind Forums

Forum, debate and message boards: If I Were President forum, and What Really Bugs Me forum. No password needed.
http://members.tripod.com/~natties_cornucopia/SPEAK-YOUR_MIND_FORUMS.html

Yahoo! Groups: Open Words

Focus:es on freedom of speech. Users must select a username and password to start new discussions or reply to existing ones.
http://groups.yahoo.com/group/openwords/

Yahoo! Group: The Intergalactic Sanctum

Topics include love, peace, happiness. Users must register to participate.
http://groups.yahoo.com/group/theintergalacticsanctum/

Vote on the Net

Have your say in today's most talked about topics. If you have an opinion on anything going on in the world, here's your chance to vote.
http://www.voteonthenet.com/

LibertyPost

News discussion forum open for people of all ideological pursuasions to browse and post articles and comments. Boards organized into issue categories.
http://www.libertypost.org/

The Mote

Self-supporting community discussing issues of politics, war, and a variety of other topics.
http://www.themote.com/

Public Debate

Australian discussion about national and international politics.
http://www.publicdebate.com.au/reaction/

The Petition

Allows users to create, and vote in, online questionaires and petitions.
http://www.thepetition.com/

I Got Issues

A place to post an issue or to respond to an issue someone else has posted.
http://www.igotissues.com/

Society for Progressive Cognizance

A forum for discussing social reform through diverse means, including technology, philosophy, psychology, biomedics, politicss, theoretical sciences, and methods of global communication.
http://spc.noodge.org/

The Big Conversation

An independent space to exchange information and ideas through online dialogue. Focus is on common ground and solutions. Forums are on health, sustainable development, CSR, religion, education, and community.
http://thebigconversation.org/

Let's Discuss

A community forum where the topic is aiming to peacefully discuss the world's problems.
http://letsdiscuss.com/

Action Forum

Discussion forums with ratings of posts from readers.
http://www.actionforum.com/

Canadian Content Forums

Discussion about issues surrounding Canadians, anywhere from politics to computing to gaming. No registration required.
http://www.canadiancontent.net/forums/

Cypriana's Corner

Discuss world politics, religion, and issues, as well as chat.
http://pub110.ezboard.com/fcyprianascorner73624frm1

Burning Horizons Network

Share thoughts and ideas or seek information and help in community forums. Any subject is welcome, from IT and science to politics and religion.
http://burninghorizons.net/

Tiny Planet

A forum for people from all over the planet to share ideas, communicate and better understand each other.
http://www.tinyplanet.org/

EZ Board: Static Friends

Discussion forum on politics, music, artwork, spirituality, and poetry.
http://www.staticfiends.com/suburbia/

Global Echo

An open publishing platform for non-mainstream political and social news and views. Includes editorials and archived issues.
http://www.globalecho.org