Suggestions for tools for trend analysis and social media listening

I want to know about tools that can be used for research purposes, specifically those that provide trending topic analysis and social media listening and mentioning trends. Some of the tools like brandwatch, hootsuite also includes social media management, which is not what I require and these tools are too costly as well.

Until now I used to follow google trends, but now I want something with deeper insights and minimal cost.
Please suggest