Photo credit: Ilja Rauski

1. Beam It Up: Compress your music, pictures or videos, and share them with a text message
2. ScreenStream: Free downloadable software allows you to show your screen to other people
3. Ulteo: Run OpenOffice online, and share your editing sessions in real time with anyone
4. Centericq: Text mode multi-protocol instant messenger connects you to major IM services through a simple interface

1. Beam It Up
   
   Beam It Up is a free online service that you can use to compress files and send them on any mobile phone. It is really fast and easy to use: just select a file to upload(music, pictures, videos or docs), choose the compression settings, type the mobile number, and a download link will be automatically sent to that number via SMS text message so that your friend can pick the file up. Free to use, no registration needed.
   http://beam-it-up-scotty.com/
2. ScreenStream
   
   ScreenStream is a free downloadable software that lets others 'watch' your screen on their computers. After you have downloaded the small application and started the sharing session, you just have to give people a link that they will have to paste into their browser without installing anything. They can continue to watch your screen until turn off screen sharing. Free to use.
   http://www.nchsoftware.com/screen/index.html
3. Ulteo
   
   Ulteo is a web-based tool that lets you run OpenOffice 2.3 online. You can manage all of your documents online in various formats(OpenDocument, Microsoft, and PDF...), up to 1GB per account, and collaborate with people: all you need is a web-browser with Javascript and Sun Java Runtime 1.4+. OpenOffice sessions can be shared with anyone. Free to use, registration needed.
   http://www.ulteo.com/
4. Centericq
   
   Centericq is a text mode multi-protocol IM client that supports the ICQ, Yahoo!, AIM, IRC, MSN, Gadu-Gadu and Jabber protocols. Despite its old-style light interface, it fully supports all of the other clients' features, such as text-chat, file transfer, contact list groups, group chats, invisible mode, and more. Completely free, it is available for download and runs on Windows, Mac and Linux.
   http://thekonst.net/en/centericq