MAXQDA - a professional software for qualitative and mixed methods data analysis

Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.

ATLAS.ti - ATLAS.ti is a powerful workbench for the qualitative analysis of large bodies of textual, graphical, audio and video data. It offers a variety of sophisticated tools for accomplishing the tasks associated with any systematic approach to "soft" data.

Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value

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.

Intercom on Customer Engagement - A book on how to create messages that drive engagement