GMate is a collection of plugins, themes/styles and other improvements to get TextMate like features in Gedit.
To install GMate in Ubuntu, use the following commands:
sudo apt-add-repository ppa:ubuntu-on-rails/ppa sudo apt-get update sudo apt-get install gedit-gmate
This package will not replace Gedit! It will only add some themes and plugins you can enable/disable from the Gedit preferences.
For more info and other Linux distributions installation instructions, see https://github.com/gmate/gmate#readme