Looking to create some sort of online register/survey of information about people, that the users can update periodically

Hello,

Here's what I'm trying to achieve...

I want to create a register of people whom are willing to volunteer to a specific community-based organisation, and to hold details of the skills/equipment/experience/expertise that they are willing to volunteer.  For the people who have already shown an interest, all I have currently is a list of email addresses. What I would need to do is to send out via email some sort of form/survey, asking to tick/untick many different boxes stating what they can do to help.  Either this of just send out a link, and have the users log in, but I realise that this would then add complexity with passwords etc.

The data will not be available to the public, but designated people should have access to the system in order to run some sort of report on, for example, all the people who have book-keeping experience, or all the people living in a specific area that can lend a minibus, or a list of people who can help with marketing etc.

I would also need for the data to be updated annually, so an user's previous answers would need to be made available to them somehow, either by sending them it via email, or directing them to log in somewhere.

As this is a volunteer-based project, there will be no funds available. I'm guessing that I won't be able to achieve all of the above without parting with some money, but what's the nearest I can get to it for free, or for a minimal expense?

Thanks for any ideas you may have.