Photo credit: Piotr Sikora

1. VoIP Communicator: VoIP software lets you have free online conversations between PCs
2. Conferencing Now: GoToMeeting close software allows you to share your screen with many features
3. PalShare: Upload and share any file up to 100MB with your friends
4. Simkl: Save all of your IM conversations online just by changing your proxy settings

1. VoIP Communicator
   
   Voip Communicator is a downloadable software that lets you call people from your PC. With VoIP Communicator you can have unlimited phone calls for free, except that you use the internet and a microphone. You can also top up your account and call normal landlines at very low rates, and also instant message with your contacts. It is free to download and use.
   http://www.voip.com/cm_index.asp





2. Conferencing Now
   
   Conferencing Now is a GoToMeeting clone, the famous screen sharing software from Citrix, with the only difference that it is completely free. You only have to sign up for a free account, and you can start sharing your desktop, control passing, session recording, annotation tools, and instant messaging, all in a GoToMeeting-like interface. Completely free to download and use.
   http://www.conferencingnow.com/





3. PalShare
   
   PalShare.com is a web-based tool that helps you upload and send your large files up to 100MB. Simply go to the site, enter the email addresses of the recipients, and upload the large file. The recipients will receive an email notification and then they can go to the site and download the file. It features a progress bar, drag and drop function, automatic zip files and folders. Free to use, no registration needed.
   http://www.palshare.com/





4. Simkl
   
   Simkl is a web app that lets us save your MSN, ICQ, Yahoo and AOL chat histories. There's absolutely nothing to download:All you have to do is to set your client's connection to a different proxy server. After that is done, Simkl will record all of your conversations and store them on its servers. Histories can be browsed by simply logging in, and can be deleted at will. Free to use.
   http://www.simkl.com/