There are some great programs that can be of use to ukulele players. Here are some of the ones I have tried and recommend (plus some ways to use them):
Recording Programs
Audacity
Audacity is a free open-source recording program. It’s simple, but has a decent number of effects to select from.
How to slow down an MP3 with Audacity
GarageBand
The be-all-end-all basic recording program for Mac. Endless learning opportunities as you record yourself to play with or track a song.
Tablature Creation Programs
Guitar Pro
My longtime choice of tabbing software, Guitar Pro 6 is easy to navigate, nice to look at, and outputs a very professional-looking product.