Photo credit: James Steidl

1. Instantbird: Multi-protocol IM software by Mozilla allows you to chat on multiple services
2. Click2Voice: Online VoIP solution lets you have free calls between any two phones in the world
3. Vidivic: Free video conferencing solution enables you to have online meeting with up to 9 people
4. Wuala: Store and share any type of file online with your friends

1. Instantbird
   
   Instantbird is a new project by Mozilla, and it's a multi-client chat software that works on Windows, Mac, and Linux, and it allows you to connect to several of the mainstream instant messaging services such as AOL, MSN, GTalk, Yahoo!, etc. The download is only 13 megabytes. There are about ten minor IM networks that Instantbird is also compatible with, although Skype is currently missing from the list. Free to download and use.
   http://www.instantbird.com/





2. Click2Voice
   
   Click2Voice is an online VoIP solution that lets you have free calls between any two phones in the world (right now only between landlines). All you need is an internet connection and a phone: enter your phone number, your friend's number, and click call: your phone will ring, and you will then be connected with your friend to talk for free. It is completely free to use, with 10 minutes per call for unregistered users, and 15 minutes for registered ones.
   http://www.click2voice.com/





3. Vidivic
   
   Vidivic is a video conferencing solution which allows you to hold online meetings using a webcam and a pc connected to the Internet. After a free registration, your are able to create meetings up to 4 hours with 9 participants at once, where you can see, talk and chat with each other. Currently in beta phase, it is completely free to sign up and use.
   http://www.vidivic.com/





4. Wuala
   
   Wuala is a free desktop application for Windows and Mac platforms that you can use to upload your files online. You can share any file such as photos, videos, music, or documents with friends or groups, or you can publish files for the whole world to see. There's no file-size limit, just a total space of 1GB (that you can upgrade). Free to download and use.
   http://wua.la