Photo credit: Kuklev

1. Vyew 3: Web-conferencing tool integrates VoIP, video conferencing and screensharing.

2. OnStagePortal: Online workspace creator lets you invite people, assign tasks and share documents
3. Joyent: Collaboration suite lets you connect with people, run shared calendars and share files online
4. Instan-t Messenger: Downloadable and web-based multi-protocol instant messenger

1. Vyew 3
   
   Vyew is a web-conferencing tool that has been out for a while now, but has just come out with version 3. While the old release allowed you to upload files, view slides together and share your desktop, this new version adds the possibility of having VoIP and video conferences with one click, with all the members of the room. You can also chat, show presentations in synchronized mode and take screenshots of any part of your screen. Free to use.
   http://www.vyew.com/

   
   
   

2. OnStagePortal
   
   OnStagePortal is an online workspace and project management tool. You can create groups, invite an people and coordinate projects by assigning tasks to them. You can have shared calendars to monitors on-going tasks, and share files and documents with all the members of the group. The free version allows you to invite up to 20 people and share files with a total storage space up to 750MB.
   http://www.onstageportal.com/

   
   
   

3. Joyent
   
   Joyent is a web-based collaboration suite that you can use to connect with a group of people. You can organize contacts, run shared calendars, and upload any file for other people to download. The free version gives you 2GB of file storage up to 2 users to try. You can then check other paid versions for more users and sharing space.
   http://joyent.com/

   
   
   

4. Instan-t Messenger
   
   Instan-t Messenger 5.0 is a free software based and web-based instant message client which allows you to sign into MSN, Googletalk, ICQ/AOL, and Yahoo all at same time. Simply download Instant-t, create a username and then add your log-in informations for your other messenger accounts and every time you sign in with Instant-t, you will sign in to your other accounts as well. Along with chat, Instan-t also supports video-chat on any IM network. Instan-t is completely free to download and use.
   http://www.instan-t.com/