Best apps

Hi I’m studying biomedical science and wondering what apps are best for studying, note taking and writing essays?

Best app which is quizlet.com, study smarter and mind map. Both app (quizlet and study smarter) are amazing and also you can make your own quiz and also use others as well. Mind map you can search online where you can make your notes .
Personally, I am using all 3 app which are amazing.