We track things like:
- Basic Camper Info
- What they are sleeping in
- Power Requirements - Are they buying into the camp genny? Payments for this
- Meal plan and non meal plan campers
- Volunteer shifts - setup & teardown, meals, etc
- Camp Dues
Some quick searching on my own yielded:
- https://signup.com - The 2.9% processing fee is a turnoff
- VolunteerDB - More suited for regional event shifts than theme camps
- RSVPMaker - Can do payments and scheduling, but looks unmaintained.