There are calculators on this site for certain trusts commonly found in the United States:

THESE CALCULATORS ARE FOR ILLUSTRATION ONLY NO LEGAL OR TAX DECISIONS SHOULD BE MADE BASED ON THESE CALCULATORS

These calculators are:

1. A Grantor Retained Annuity Trust (GRAT) calculator
   This calculates:
        Annuity Factor
        Annuity Value
        Gift Value
        Remainder Value for a GRAT
    (where available the §7520 rate is provided)
2. A Qualified Personal Residence Trust (QPRT) calculator
   This calculates:
        Remainder Factor
        Remainder Value
        Mortality Factor for current age
        Mortality Factor for age at end of QPRT
        Probability of surviving QPRT
        Value of gift based of survivial probablity
        Gift Tax Payable
    (where available the §7520 rate is provided)
Mortality Tables 90CM and 2000CM have been loaded and are used as follows: pre May 1, 2009 uses 90CM from May 1, 2009 uses 2000CM.

3. A Charitable Lead Unitrust (CLUT) calculator
   This calculates:
        Unitrust Payout Rate Adjustment Factor
        Adjusted Payout Rate
        Interpolation Adjustment for the Table S Remainder Factor
        Interpolated Table S Remainder Factor
        Remainder Interest Amount
       
Table S for Mortality Tables 90CM and 2000CM have been loaded and the relevant table shoud be selected (2000CM is selected by default).
 

 A table of Section7520 rates used by calculatoes on this site is available here.