Audacity is a free program that can do this using the speed control (changing pitch and tempo just like changing speed on a tape recorder). If a tape was recorded at 7 1/2 IPS and a machine with only 3 3/4 IPS is available, Audacity can record from the low speed machine and then the replay speed can be set to double.
The link below covers changing speed with or without a change of pitch.
https://www.lifewire.com/audacity-tu...-pitch-2438167