MAXQDA - a professional software for qualitative and mixed methods data analysis
Xmind - Xmind is a brainstorming and mind mapping application.
QualCoder - A very complete Free and Open Source Software (FOSS) Computer-Assisted Qualitative Data Analysis Software (CAQDAS) written in Python. It works with text, images, and multimedia such as audios and videos.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
RQDA - RDQA is a R package for Qualitative Data Analysis, a free (free as freedom) qualitative analysis...
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.