Ohio University subscribes to NVivo, so free to OU users. Features: import data, analyze data, viz tools, identify themes

Dedoose is a web application from UCLA.  Features: intuitive user interface, data viz, data usage tracking, high level coding tree structure. Web based, not platform specific. Dedoose is one of the less expensive options, since you can subscribe monthly instead of paying an annual fee. Pricing information for Dedoose.

The University of Surrey offers these reviews of CAQDAS tools. 

U of Minn's Guide to Digital Humanities tools includes another list.