Photo credit: Clix

1. DabbleBoard: Invite as many people as you want to whiteboard online
2. PersonalGrid: Free 2GB of storage space where you can upload and share files
3. Barablu: Mobile VoIP client lets you make free calls to PCs to multiple networks
4. Evermotion Communicator: Free multi-protocol instant messenger for Windows

1. DabbleBoard
   
   DabbleBoard is a free tool that you can use to whiteboard online. You can create a new whiteboard at anytime and, after a simple log-in, you can invite as many people as you want to join you and start drawing with you. When you are done, you can download you creation on your machine in PNG format. Free to use.
   http://www.dabbleboard.com/





2. PersonalGrid
   
   PersonalGrid is a file hosting service that gives you up to 2GB of storage space, and where you can upload and share files. You can create folders, and select the people you want to share a file with, or simply get a public URL for anyone to access and download that particular file. The service is free to use, registration is needed.
   http://personalgrid.com/





3. Barablu
   
   Barablu is a VoIP application that works on any PocketPC, or on any PC running Windows or Mac. It allows you to have free voice calls with anyone on MSN, Yahoo, Google Talk, Skype, and Barablu networks, while you'll have to pay a small fee for any mobile or landline calls. The software is free to download and use.
   http://www.barablu.com/





4. Evermotion Communicator
   
   Evermotion Communicator is a free multi-protocol instant messenger that works with Yahoo, ICQ, AIM, MSN, Skype, Tlen, Google Talk and and also local LAN networks. It supports multilingual interface, file and image transfer (with basic image editing), and group chats. It work on Windows platforms only, and it is free to download and use.
   http://ec.evermotion.org/