There are many other kinds of trusts that are used to hold property for specific purposes and for the avoidance of tax liability, including Qualified Personal Residence Trusts (QPRTs), Irrevocable Life Insurance Trusts (ILITs) (this can be a key tool for estate planning for a successful small business person), Intentionally Defective Grantor Trusts (yes, intentionally defective), Grantor Retained Annuity Trusts (GRATs), Grantor Retained Income Trusts (GRITs), etc.  The more exotic trusts may not be appropriate for most families or individuals, but they can be quite useful in the right situation.