Photo credit: Pmtavares

1. Xpanity: Browser plug-in lets you chat with people visiting your same web-page
2. Jjot: Web-based service allows you to take notes and to share them with other people
3. PlotBot: Collaborative writing software enables you to write text with other people

4. Bing: Java-based mobile instant messenger allows you to chat with people from your mobile phone

1. Xpanity
   
   Xpanity is a browser plug-in that allows you to chat with other people visiting the same web-page as you. All you have to do is to download and install a small application, and then you can start browsing and talk with the people looking the same site. Plus, you can "stick" comments to a page, so that everyone can see them.
   http://www.xpanity.com/





2. Jjot
   
   Jjot is a web-based service that you can use to take notes, access them from anywhere and share them. You can create as many notes as you want, format the text, add links, drag and drop notes to arrange them, and also print them. Plus, you can share them with everyone via email, and grant people the ability to edit them for you. Free to use.
   http://jjot.com/





3. PlotBot
   
   PlotBot is a collaborative writing software that enables you to write text with other people helping you. You can create private projects to work alone or with invited friends, or you can create public projects too allow anyone to join. All changes are tracked to each writer, and you can revert to prior versions at any time. It requires registration and is free.
   http://www.plotbot.com/





4. Bing
   
   Bing is a mobile instant messenger that works on any java enables mobile phone. Simply download and install it on you mobile device, and you are ready to start chatting with your MSN, ICQ and AIM contacts from anywhere. It is free to download and use.
   http://www.bing.im/en/