We have chosen some of the best websites that offer similar content. Here is the list in no particular order.
Message Wishes
This website offers wishes, messages and greeting cards for different occasions.
Google SMS
Listing ways on how to use Google for sending instant message.
Yahoo SMS [Supports India and Pakistan]
Excellent resource on sending SMS messages through Yahoo! Messenger to your family, friends and relatives.
Sending SMS through Gmail
Did you know that you can send Instant Message through Gmail? This resource includes all the details on sending a regular text.