Vim is a highly-configurable text editor built to enable efficient text editing. It is an improved version of the vi editor distributed with most UNIX systems.
This plugin with CA Agile Central provides the ability to search and display stories, tasks, and defects. It also supports updating task estimate and to do. Lastly, you can also show iteration burndown and cumulative flow charts for the current active iteration.
Written mostly in Ruby, this plugin requires vim7.2 patch 374 or greater (that patch has a required Ruby interface fix) and Ruby 1.8.6 or greater. See the installation file for details.
View the vim4rally repo in Github for installation information.
Cost: Free (donations accepted)