LetMe Type is a tool which completes a word or a piece of text we type dynamically. As we type the words the application gives us the next few possible words which might complete the sentence for us. The application learns what we type and then suggests the possible words that we might be using. A very cool and very useful tool for anyone.
The tool initially seems to have been shareware but is now open source and licensed under the GNU GPL. Find a screen shot of the same in action here.