This package is a query builder for the SphinxQL SQL dialect. Sphinx is the search server.
It's very similar to what FuelPHP 1.3 offers in terms of query builder. It maps the entire SphinxQL function list. The readme on github contains the entire set of methods.
It's advisable to use SphinxQL instead of the Sphinx API as it's fairly faster and allows interacting with the RT indexes. It's probably also more straightforward to use, especially in a FuelPHP project.
I've just completed unit testing for the package.
https://github.com/FoolRulez/fuel-sphinxql