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.
ITM Platform - Cloud-based Project Management Solutions
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.
Planisware - Planisware PPM software supports NPD and R+D processes to help organizations make confident business decisions.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Workfront - Award winning project management software helps you manage projects in one place. A cloud-based work management tool for marketing and IT teams.