Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
All Note - All Note app contains features to enable users to share their world-changing ideas with their friends and family members after writing them on the mobile phone’s screen. It supports various file formats such as HTML, Docx, doc, and pdf, etc.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
AllMyNotes Organizer - AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Simplenote - The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.