Photo credit: Tina Rencelj

1. Writeboard: web-based editor enables you to write online documents and collaborate with colleagues
2. activeCollab: server-based open-source free online collaboration space to share, comment, interact, revise, collaborate, and collaborate
3. TracBac: hosted online service support creative work projects collaboration by providing audio commenting, alerts, IM integration and more to distributed design teams
4. WebBrush: online multiuser web application for creating projects and sharing your photos and diagrams
5. Radio Handi: group messaging and direct marketing tool to create communities on any subject

1. Writeboard
   
   
   
   Writeboard is a web-based editor that enables you to write online documents and collaborate with colleagues. You can subscribe to documents via RSS to be notified of changes and keep your writings organized with Backpack integration. Writeboard requires Internet Explorer 6.x, Safari, or Firefox and it is free to use.
   
   http://writeboard.com/





2. activeCollab
   
   activeCollab is an easy to use, web-based, open-source collaboration and project management tool. activeCollab allows you to set up an environment in which you, your team and your clients can collaborate on active projects using a set of simple, functional tools. activeCollab is a script that must be installed on your own web server and requires PHP5 to run. Free download.
   http://www.activecollab.com/





3. TracBac
   
   
   
   TracBac is a web-based application to share, comment, interact, revise, collaborate, exchange your creative works with your clients. With integrated features like audio comments, post-it notes, visual tools for marking and reviewing, IM integration, instant email alerts, users have the power in their hands to review things faster and better. TracBac requires no downloads and no installation. All you need is a web browser and an internet connection. Everything will happen inside your browser. TracBac supports Mozilla Firefox, Opera, Microsoft Internet Explorer 6, Camino and Safari. Free to use.
   http://www.tracbac.com/





4. WebBrush
   
   WebBrush is a online multiuser web application for creating and discussing projects and sharing your photos, charts, diagrams, schemes, etc. WebBrush can be used in educational purposes (on-line multiuser consultations, lessons or in solving some tasks). Also WebBrush can be useful for those who provide technical support service. WebBrush provides a chat panel for talking, an instrument panel for drawing and text tools for typing. Free to use.
   http://stanfy.com/dev/webbrush/





5. Radio Handi
   
   Radio Handi is a group messaging and direct marketing tool. Radio Handi enables you to create communities about any subject or group of people, and to communicate with your group via live telecasts, group voice chats (conference calls), voice messaging boards, email and SMS, all for the cost of a local call in over 30 countries. You can start a free conference call via email (no registration required), just send an email to invite several friends to a conference call, and simply BCC [email protected] Radio Handi will create a conference room and invite everyone with dial-in instructions. Radio Handi supports the following carriers: Cingular, Sprint, Nextel, T-Mobile, Alltel and Verizon as well as many others. Radio Handy is free (normal messaging/airtime charges apply).
   http://www.radiohandi.com/