Eric Tivers recently published his view of the 30 best apps for those with ADHD in ADDitude Magazine (go to this link.)  I would like to add one more that both my husband and I use very successfully - WorkFlowy.  This is a VERY simple outlining program that is really great for capturing and organizing information like 'to do' lists, grocery lists, and presentation outlines.  Very flexible, very simple, and it goes across your various devices.  Take a look at the article to see if any of the apps might help you be more productive (or get more sleep!)