Tips on how to manage multiple Projects at once

Heyy,

I am working on around 15 Applications at once. Its getting difficult for me to manage or track the status of all new Features to be added or Issues to fix. I know many professionals might be handling more than 15 Applications at once. Even I want to learn how to manage this many applications simultaneously, so that I can effectively complete all Projects on time. Can anyone tell me how do you do that?