For free BuddyPress theme, you can check BuddyX. It is a BuddyPress dedicated theme.
You can build Online Social Community, Intranet or Extranet Website Using Free BuddyPress theme. No coding required! Beautifully designed to create a stunning social network website for all niches and is equipped with clean code and easy-to-customize options.
You can also try the demo to check the functionalities and layout.