Sublime Text syntax and completions files for Turtle (and, later, SPARQL). Developed for Sublime Text 3 beta.
Copy the 'Turtle' and 'SPARQL' directories into your Sublime text 'Packages' directory (use 'Preferences | Browse Packages...' in Sublime Text to find where that is).
Sublime Text uses the same syntax mechanism as TextMate and other editors. See unofficial Sublime Text documentation for details.
For information on Sublime Text completions, see the unofficial Sublime Text documentation for details.