The application I use the most now are the following:
eSteem: To access my Steemit account from my smartphone
Actifit: To lose weight and support the project.
Dtube: Produce my daily vlog there.
Busy: Just started to use it over the classic user interface of Steemit.
Steemauto: Schedule post automatically.
According to the rules, only Actifit and Dtube are valid answers. But thanks for joining :0)