IM+ is a free web based instant messenger that lets you connect to multiple IM networks from within your browser. You can also choose to create a free IM+ account, and then store your login details of all IM networks in that account. Then when you login to IM+, it will automatically login to all your IM accounts.
When you login to multiple IM networks with IM+, it shows all your contacts together in one contact window. To chat with anyone, just double click on the name, and IM+ will open the chat window on right side. In the screenshot below, I am connect to Yahoo, Skype, and Gmail. I have also opened three separate chat windows together.
IM+ supports following IM networks:
You do not need to download or install anything to use IM+. Just go to plus.im, and provide your login details, and start chatting.
Also check out other free web based instant messenger.
If you create a free IM+ acount, then you can also store chat history online. Also check out Simkl IM to record Skype calls.