IBM Rational DOORS Next Generation - IBM Rational DOORS Next Generation provides a scalable solution to optimize communication, collaboration and verification of requirements.
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.
Reqtify - Reqtify is an easy to use, interactive application for managing requirements.
Standard Notes - A safe place for your notes, thoughts, and life's work
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
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.