Surveytagger is described as 'takes in customer comments in an Excel file and tags the comments with topic and sentiment. Results are presented in a dashboard with drill-down capability and Excel exports'. There are more than 10 alternatives to Surveytagger, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Android. The best alternative is Qiqqa, which is both free and Open Source. Other great sites and apps similar to Surveytagger are ATLAS.ti (Paid), CATMA (Free, Open Source), TextSTAT (Free) and Quirkos (Paid).
AntConc is a freeware, multiplatform tool for carrying out corpus linguistics research and data-driven learning. It runs on any computer running Microsoft Windows (tested on Win 98/Me/2000/NT, XP, Vista, Win 7)
SentiStrength estimates the strength of positive and negative sentiment in short texts, even for informal language. It has human-level accuracy for short social web texts in English, except political texts.
Emdros is a corpus query system for storage and retrieval of linguistic analyses of text. It is especially applicable in corpus linguistics dealing with syntax, morphology, phonology, and/or discourse. It is also a generally useful text database engine.