8. Gmail calendar
The most useful app on my iPhone for me is my Gmail calendar. It is synchronized to my calendar at work so I have all my personal and work related events all in one source. This becomes critical from an organizational standpoint as it has allowed me to efficiently manage everything pertinent to my daily schedule including research meetings, lectures/presentations, or meetings with industry representatives. In addition, my staff has access to it at the practice so adjustments can be made to the schedule to account for new events in real-time.
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