Autocomplete or wordprediction in Linux

I looked for an word prediction feature in a simple text editor and found one for gedit.

At https://github.com/nagaozen/gedit-plugin-autocomplete/ you can find one.
Install script is in the download; make install file executable.
After the install go to Preferences, plugins, check the autocomplete plugin, select it and go to configure and add a wordlist (each lines, one word) to the open text pane.
For more elaborate snippet-like TextMate like code prediction, useful for programmers look at gmate-git.
Another option is (not tested) http://code.google.com/p/gedit-tm-autocomplete/.