reservation plugin

For my kajak club website, I’m trying to find a plugin that makes possible to reserve kajaks. I think I’ve gone through all possible plugins without quite finding what I’m looking for.

Maybe I have overseen something. Any tips will be apreciated.

• We have about 15 kajaks;
• they have to be reserved down to the minute (or every 30 minutes) with possibility to reserve many days.
• Price is not relevant, as they are free for members.
• Of course, reservation occurs at registered members level (and not all reg. members can reserv)
• it is not possible to reserv a kajak more than 15 days from now.
• Automatic recurring reservations are not allowed.
• Members can edit and delete their own reservations
• Administrator has to be able to delete, edit reservations and set kajaks on stand by.
• calendar views (month/week)
• It has to be free and opensource (really free)