TeamViewer, GBridge, Blink, CrossLoop, and ScreenStream
Gbridge – It features DesktopShare, SecureShare, AutoSync, and EasyBackup for free, as long as you have a free Gmail account and supported OS. Gbridge uses Virtual Private Network among Gmail contacts to start collaborating, no matter where they are. It runs on Windows 7, Vista, and XP operating systems.
Blink – It features Voice over IP (VoIP), desktop sharing, instant messaging, and file transfer among computers with Blink software. It’s free to use on computers running Windows, Mac, and Linux.
CrossLoop – Similar to any type of desktop sharing software, CrossLoop lets you provide access to your friends, family, or colleagues to your computer. CrossLoop's free, pro, and remote access editions are available for Mac, XP, Windows 2003, Vista, and Windows 7.
ScreenStream – Watching or sharing your desktop to friends using ScreenStream is free. Friends who want to view your desktop need not install any software. All they have to do is access an Internet browser. The session starter simply provides the link address with optional access code to contacts and starts sharing the desktop using the browser, over an Internet connection. ScreenStream runs on XP, Windows 2003, Vista, Windows 2008, and Windows 7. You can invite friends to view your desktop even if they are using Mac, Windows, or Linux with Internet Explorer, Safari, Firefox, Opera, and other browsers.
TeamViewer – A file transfer, desktop and remote sharing solution that comes with different licensing – free, business, premium, and corporate licenses. All licenses are unlimited licenses, which means it’s a one-time fee only. All you need is to download and install TeamViewer on Windows, Mac, Linux, iPhone, or Android devices and start entering the partner ID that is generated on both PCs.