Sentiment analysis tools are type of software or applications that helps to understand the sentiments of the people towards a particular product, services or campaign prompting a particular brand or towards social issues. Such tools help to comprehend the feelings, thoughts, attitudes, opinions and views of different types of people in different situations. If you are looking for a most powerful open source sentiment analysis tools you need to find and check the software on trial and then choose the right one.
The few most popular and reliable open source sentiment analysis tools are Python NLTK (Natural Language Toolkit), http://www.nltk.org, R, TM (text mining) module, http://cran.r-project.org/web/packages/tm/index.html, RapidMiner, http://rapid-i.com/content/view/184/196 and GATE, the General Architecture for Text Engineering, http://gate.ac.uk/sentiment/.
All these tools may be effective for you but acquiring the tools would be not affordable for everyone and your data would be also not safe or accuracy would be not acceptable. May be few tools work for you, depending on the situation and quality of results you are expecting. And for sensitive issues and companies profound towards their image in the market should avoid such free tools instead adopt other professional ways to do the sentiment analysis decorously.
The another way to do this task is outsource the project to professional companies providing sentiment analysis services who use the combination of natural language processing tools, text analytics, and computational linguistics with human insights to understand the feelings of different people and give the better results. Cogito Tech is a leader in providing the Data Outsourcing Services and sentiment analysis services using the right API and tools to deliver accurate data labeling services through trained professionals for getting the true sentiments of the customers or targeted audiences.
