At the end of an obituary, it is common for the family to list an organization or charity where people can make a monetary donation in the deceased person’s name.
Go to the How to Write a Good Obituary page for examples.
It also is acceptable not to list a charity in the obituary. It’s really up to your family and what your loved one would have wanted. Some people leave instructions in their estate planning documents about which charity they would like people to support.