Photo credit: Paulo Correa

1. Privnote: Send notes that will self destruct after being read
2. Tweetparty: Create messaging groups with your Twitter account
3. Dexrex: Store all of your instant messaging sessions online
4. Neos MT: Connect to all major instant messaging networks with one single client

1. Privnote
   
   Privnote is a free service that allows you to send self-destructing notes. When you want to pass a note to someone, just type your message, click post, and share the link with someone. When the other person opens the link, it will automatically destroy itself. You can also get notified via email when someone gets your message. Free to use, no registration needed.
   https://privnote.com/








2. Tweetparty
   
   Tweetparty is a free service that lets you create groups with Titter accounts. Just login with your Twitter credentials, give your group a name and, after you have added Tweetparty to your contacts, you can start messaging with all the people in the group directly from your account page. Free to use, Twitter account required.
   http://tweetparty.com/








3. Dexrex
   
   Dexrex is a secure online personal database for IM conversation. Once you install it on your computer it will automatically sync with Dexrex servers, letting you archive instant messages and search through them, share them, and access them at any time from any computer with an internet connection. Dexrex works with all major IM clients, and it is totally free to download and use.
   https://www.dexrex.com/








4. Neos MT
   
   Neos MT is a multi-protocol instant messaging client for MSN, ICQ, Yahoo and Jabber networks. You can chat with one or more people in your contacts, have video and audio conferences, whiteboard, tranfer document and files. It work on Windows online and it is free to download and use.
   http://www.neosmt.com/eng/index.php