
Photo credit: Stephen Mackins
Task2Gather: Manage all of your projects and assign tasks to your team members
Kluster: Discuss on ideas and projects with your team
On-Wiki.net: Create free wiki pages without signing up
Userplane Boards Create message boards and interact with other people in real-time
- Task2Gather

Task2Gather is an online project management application that allows you to manage all of your tasks from one place, just using an Internet connection. You can create as many projects as you want, and invite an unlimited number of people in the group and assign them tasks. Task2Gather is completely web based and free to use.
http://task2gather.com/
- Kluster

Kluster is a group decision-making platform that anyone can use to discuss on ideas and project with his own team. After a free sign up, you can start you own kluster: give it a name, type questions and ideas, set answers criteria, wait for your colleagues' feedback and then see detailed results of what they voted and suggested. Free to use.
http://www.kluster.com/
- On-Wiki.net

On-Wiki.net is a free service to create wiki pages. To start a new wiki, just type your desired name, click OK, and then start creating and editing your own wiki:you can create as many pages as you want, invite unlimited people to join you, add attachments, track changes and more. Free to use, no registration is needed.
http://www.on-wiki.net/
- Userplane Boards

Userplane Boards is an advanced Flash based bulletin board platform that combines the benefits of persistent forums with the real-time interactivity of chat. After you sign up for free, you can create as many boards as you want, personalize them, embed them on every site, and people can then start posting messages, which will appear in real-time like a normal text chat. Free.
http://www.userplane.com/index.cfm?fuseaction=apps.boards