Photo credit: Sebastian Kaulitzki

1. Tokbox: Web-based application lets you have video conferences with your friends
2. I-msgr: Create your own, personalized instant messenger with no technical knowledge
3. Sheetster: Online collaborative writing tool allows you to create and share spreadsheets online
4. SrevIM: Downloadable instant messaging application enables you to connect to multiple IM networks at once

1. Tokbox
   
   Tokbox is a web-based video conferencing application that anyone can use to have one-to-one video meetings online. After a simple registration, you are able to create your video room where you can invite a friend and have a video conference with him. You can either embed your conference room on your site, or simply login in your Toxbox page and provide your friend's email to start the conference. Free.
   http://www.tokbox.com/





2. I-msgr
   
   I-msgr is an online service for creating your own instant messenger. You can setup a messenger for your group of friends, e-group, visitors to your website, or even your intranet without having to know any programming language. Its main features are text-chat, file transfer, emoticons and contact list. Free to use, registration required.
   http://www.i-msgr.com/





3. Sheetster
   
   Sheetster is an online collaborative writing tool that allows you to create and share spreadsheets online. You can use Sheetster to upload and collaborate on existing Excel documents, or to make new spreadsheets to share with friends and colleagues. When you're done, you can download or embed your spreadsheet on any web-site. Registration is required and it's free to use.
   http://www.sheetster.com/





4. SrevIM
   
   SrevIMis a downloadable instant messanging application that enables you to connect to multiple networks at once such as Yahoo, MSN, AIM, Google Talk and ICQ. After you register to the service for free, you can download the 18MB setup, and start chatting on major IM networks. Free to use.
   http://www.srevspace.com/