CoovaAP is an OpenWRT-based firmware designed especially for HotSpots. It comes with the CoovaChilli access controller built-in. CoovaChilli is an improved version of Chillispot which is included in DD-WRT.
Now you can use the CoovaAP firmware with the built-in CoovaChilli. The installation guide can be found on this page:
For more information on CoovaAP, you can visit: http://coova.org/wiki/index.php/CoovaAP
For CoovaChilli, you can visit: http://coova.org/wiki/index.php/CoovaChilli