I used Statistica 4.0 (for free) before it bought up by SPSS (Currently also known as SBAS). And I would like to see its up-to-date improvement, for free, of course.
The interface was user friendly and the online text explanation was great I still remember.
Anyway, a free analysis tool named PSPP (can apply code/syntax from SPSS; write data Stata, R, Excel, txt, ... ) I would like to recommend to reader.