It seems this is specifically a list of programs that don't charge for sharing/transferring. If so, it might be helpful to add that language to the title.

EVA Evergreen - Members may transfer miles to other members at no charge. However, transferred mileage cannot combined with recipient's own mileage or other third party mileage, so seems to negate the value of doing so. I've never been clear about why this is offered when a member can simply book an award ticket for the other person.

Etihad Guest - Family membership. When anyone enrolled in your Family Membership travels with EY or partner airline, 100% of miles (RMs) earned are transferred to Family Head's account, including any bonus miles. Each member continues receiving 100% of tier miles (EQMs) and personal tier benefits, so still eligible for promotion to silver and gold.