Assuming you have a a compatible phone, or other device for syncing, the only software is the free Fitbit app. There are some other exercise and food tracking apps that can connect to Fitbit, but certainly not required - more for people who are using one of the other apps and want to connect that data to Fitbit.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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