http://tandemtegenkanker.be [2] is a drupal 6 site for a charity organisation in belgium. The site user base is divided into groups who challenge each other to raise money to combat cancer. Visitors can sponser groups and group members.
Links[1] https://dominiquedecooman.com/projects/tandem-tegen-kanker [2] http://tandemtegenkanker.be [3] http://one-agency.be [4] https://dominiquedecooman.com/project-type/commissioned-projects