VM - Screen Sharing

Tools:
RealVNC
CrossLoop
ShowMyPC
WinRemotePC Lite
Remote-Anything
TeamViewer
Access Remote PC
Im InTouch
Spy Agent

Tool : Adobe Connect Now

Features :

Interact with others
Use screen sharing, chat, notes, audio, and video to conduct meetings online that can be as interactive and productive as in-person meetings.

• Get instant access from anywhere
  Use any platform and any browser with no special downloads necessary to join the meeting — all you need is the free Adobe Flash Player runtime.
• Be productive right away
  With instant access and an elegant user interface that is remarkable easy to use, you can start being productive right away. No training necessary.
  
• Request control of another computer
  Take control of another meeting participant's desktop with permission. This is useful for collaborative work sessions and technical support.

TOP FEATURES

• Screen sharing
  Easily enable meeting attendees to see what's happening on your screen. Choose from three sharing options: windows, applications, or your desktop.
  
• Whiteboards
  Use familiar tools to mark up what's being shared onscreen. Draw lines and shapes, drag and reshape them, add text, and save the Whiteboard as a PNG file.
  
• Screen-sharing palette
  Access key meeting features while you're sharing your screen. You can even have a private chat while screen sharing since the palette is invisible to meeting participants.
  
• Remote control
  Take control of another meeting participant's desktop with permission. This is useful for collaborative work sessions and technical support.
  
• Video conferencing
  With a webcam, use multipoint video for a real in-person feel to your online meeting.
  
• Integrated audio choices
  Use the microphone on your computer to speak with other meeting attendees. Or use one of the conference numbers provided for traditional teleconferencing.
  
• Chat pod
  Send instant messages to one person or the whole group to raise questions and share ideas. Customize your Chat pod by selecting fonts, sizes, colors, and emoticons.
  
• Unique meeting room URL
  Take advantage of a personal online meeting room with a permanent URL that is easy to remember, so you'll always know where to meet online

More .. http://www.adobe.com/acom/connectnow/

Free/Buy :
Online
Free for up to three users
15 users costs $39. After that, the professional level does get pricy

-----------------------------------

Tool : CrossLoop
Features :

• CrossLoop provides a quick, easy, and completely free way to give a colleague, a friend, or a relative access to your computer. After installation, your PC will be assigned a 12-digit access code each time you start the program. You then give that number to another user to virtually share your desktop. Once connected, that user will have full access to your machine.
  
• The odd nature of sharing a desktop cursor and the inability to add multiple users makes CrossLoop illogical for proper business presentations. However, the complete system access and 128-bit encrypted connection combine to create a great solution for low-budget, long-distance tech support. Guests can use any app and save files on your computer, as if they were sitting in front of the machine. No router configuration is required--a big plus. File transfers are now supported, but the purpose here remains collaboration: CrossLoop doesn't work without explicit permission from the host.
  
• Since simplicity is a key attraction, it lacks more advanced features, and the connection must be made in two minutes or it times out. While the interface and the features are simple, CrossLoop offers a secure and fast method for two users to collaborate on one PC.

More.. http://download.cnet.com/CrossLoop/3000-2654_4-10602416.html

Free/Buy :
Online Free

---------------------------
Tool : ShowMyPC

Features :

ShowMyPC provides free and premium tools for Instant Collaboration to all users. Software includes Desktop Sharing, Screen Recording, Remote PC access. The tools are community alternatives to WebEx and Gotomypc among others.
Featured Remote Support Services Free!! Instant No Installation, No registration, No logins. Screen Sharing and Application Sharing. Chat and White board, Screen Recording. Built using standard SSH and VNC software. Customizable Remote Support

More...http://showmypc.com/

Free/Buy : Online Free