Photo credit: Renee Reeder

1. TokBox AIR: Have video conferencing on any machine with Adobe AIR environment
2. Goober: Instant message with people while having VoIP conferences and sharing files
3. AtWiki: Create free wiki pages, invite people, and share files
4. Uptogo: Review, approve and exchange projects online

1. TokBox AIR
   
   TokBox, a video chat startup that doesn’t require any kind of extra software, has launched a new Adobe AIR app that will bring the TokBox video conferencing system to any desktop running Windows, Mac, and Linux. After you install the application, you can login with your Tokbox credentials and start chatting and having video conferences with all your contacts. Free.
   http://www.tokbox.com/view/downloads








2. Goober
   
   Google is a Windows only instant messenger and VoIP system that you can use to keep in touch with all of your friends. It features text chat, group chatting, free VoIP conversations, video conferencing, encrypted file sharing, multi-messenger (MSN, ICQ, as well as Yahoo, Jabber and GTalk which will be added soon), and more. It is free to download and use.
   http://www.goober.com/






3. AtWiki
   
   AtWiki is a free wiki hosting service that lets you to set up your own wiki and start collaborating online. To create a wiki, just enter your desired wiki URL and start inviting people: you can create new pages and let others edit them, upload files, send mass email messages to all the members of the group, and get every update as it happens via RSS feed. The service is completely free to use.
   http://www.atwiki.com/






4. Uptogo
   
   Uptogo is a simple approval/feedback platform designed to help enhance communication between teams and clients. Its simple web-based interface allows users to exchange, review, approve and transfer various types of creative content from any location: you can create a project, upload files of any kind, and let others approve your work. The free version gives you up to 100MB of storage space and one active project.
   http://www.uptogo.net/