Evernote
Evernote is a cross-platform, premium app designed for note taking, organizing, and archiving. The app allows users to create a "note" which can be a piece of formatted text, a full web page or web page excerpt, a photograph, a voice memo, or a handwritten "ink" note. Notes can also have file attachments. Notes can be sorted into folders, tagged, annotated, edited, given comments, searched, and exported as part of a notebook.
OneNote Mobile
Microsoft OneNote is a computer program for free-form information gathering and multi-user collaboration. It gathers users' notes (handwritten or typed), drawings, screen clippings and audio commentaries. Notes can be shared with other OneNote users over the Internet or a network. OneNote is available as a part of the Microsoft Office suite.
It is also available as a free stand-alone application for Windows, Mac, Windows RT, Windows Phone, iOS, Android and Symbian.
Remember The Milk
Remember the Milk is an application service provider for Web-based task- and time-management. It allows users to manage tasks from a computer or smartphone, both online and offline.
Remember the Milk allows users to create multiple task lists. Added tasks can be edited (or not) to include various fields; locations can be added, and an integrated Google Maps feature allows users to save commonly used locations. Tasks can also be organised by tags. Tasks can be postponed, and Remember the Milk will inform users of the number of times a given task has been postponed.
Google Tasks
Google Tasks is naturally integrating into Google Calendar. For this tasks no permanent internet connection required. The app will sync updated tasks as soon as an internet connection is available. Your tasks are backed up when required. we manage our tasks conveniently on our home/office PC, and have them synced to your iPhone/iPad.