There are so many more apps available now, and I haven't been out of school very long! I think it is important to keep track of your to-do list and your calendar first and foremost. I use Microsoft Outlook for that in my professional life, but used a hard copy calendar for my undergrad programs. Google Calendar is nice too, I use that for personal calendars and tracking my grad school assignments - I like that you can set reminders to popup on your computer and phone so you don't forget things.
Other apps that might be useful for college:
EasyBib http://www.easybib.com/ - helps with citations for papers
LinkedIn http://www.linkedin.com - start building your resume and your professional network online and connect with students, guest speakers, and anyone else you meet in this professional network. Sometimes getting a job is more about who you know these days.
Trello <span style="color: rgb(84, 83, 83); background-color: transparent;">comes highly recommended for project management and group work - I just downloaded it and will be putting it to use for my job and school work.</span>
Check out: https://www.society19.com/25-apps-every-college-student/ for a more comprehensive list