My staple of favourit eapps changes regularly depending on my needs. Right now I rely on the obligatory social networking apps; twitter, facebook, linkedin, etc. But there are a few which I find myself returning to time and time again.
The reminders are where this app truly shines, giving me the option to remind myself any time of day, with repeating reminders for bills. This app has saved my brain many times. Available on Android with widgets. Free!
Allowing you to choose which pill you are using, you can set the date you started your current pack and what time of day you like to take it. Once set up the app dutifully reminds you every day, at your chosen time and with your ring tone of choice, to pop your pill. Works well but crashes constantly. Free on Android.