Charity website

My charity is interested in replicating many of the aspects of [[login to view URL]][1] on our own website. We would like to have web accessable? online collaborative development projects. The most important aspects of the site are the following functions: 1) database of volunteer expert's user accounts 2) database of question poser's? user accounts 3) method for posting, accepting and managing active projects including? automatic matching of skills with requirements and moderator function The site must be simple and functional so many of the presentational aspects of the example site are not required e.g. video posts and snippets in sidebar from various members.