BuddyPress.org

I can recommend the WooCommerce WooMembers bundle – allows you to limit access to the site and take monthly subscription payments: https://woocommerce.com/products/woomembers-bundle/

It mostly works with BuddyPress (in that you can limit access to most pages and bbPress forum posts) but they do have work to do to make it fully protect a BP install, but it is on their radar.

Hope that helps