Hands down, Evernote is the champion of these types of tools. If you need to capture bits of data, large or small, then Evernote is the tool to use. The fact that its search function is so good, you could just throw everything into one giant pile and then just use search to find what you need, is amazing! I don't use it that way. The ability of the app to OCR even text in photos is mindblowingly helpful. If you need to remember and keep track of something, use Evernote.