Some long-standing lists of summer camps for the gifted include those curated by
- Hoagies Gifted Education Page lists
- Davidson Database list
- NAGC list
- Each State's local NAGC affiliate
- Many colleges
The lists do not all seem to be updated yet for 2015, but often contacting an institution results in them completing their updated annual list rather quickly.

The Davidson Database offers questions to guide decision making in on summer camp experiences:
Tips for Parents: Finding a Summer Camp - http://www.davidsongifted.org/db/Articles_id_10199.aspx
Summer Programs (residential & day camp links) - http://www.davidsongifted.org/db/Articles_id_10069.aspx
Tips for Parents: Outside of School Educational Opportunities - http://www.davidsongifted.org/db/Articles_id_10680.aspx

Hoagies also has a page of tips on selecting a camp, which in many ways mirrors a school selection process.