Tiger Tables version 2006 is the current version 

Besides an improved look and feel, and all of the new features added since 1999, the 2006 version of the program has several totally new and useful features. Click on one of the links at the bottom of the page to download a free demo or to order Tiger Tables.  Click here to see a complete list of Tiger Tables calculations.  New features include:

(1) Complete help screens for every page.  See author Larry Katzenstein's explanations of the techniques and find help for every entry or answer field; and 

(2) Automatic, in the background updating of section 7520 rates.  If a charitable deduction is involved, Tiger Tables will provide a range of three months' rates and recommend the best rate.  

Other new features:  the private annuity calculator will now calculate private annuities which are deferred or graduated (or both).  Charitable lead trusts have been added.  The lead annuity trust calculator will calculate the value of an annuity in an eroding corpus trust as provided in the section 7520 regulations (wrong as the author believes those regulations to be!)