Work over SuperMemo 9 started in Fall 1997. The program was extensively rewritten in Delphi 3.0 and later recompiled with Delphi 4.0 (SuperMemo 98 freeware was later recompiled in Delphi 6.0). SuperMemo 99 witnessed the expansion of the customer base to the magic barrier of one million.
The two steps in the development of SuperMemo 9:
In March 2005, SuperMemo 98 was released as freeware. You can download SuperMemo 98 freeware from here!