can you provide more detail on what equipment you're getting the data from? Is it commercial equipment or custom made? What form is the data currently in?

I have data in the form of  mW/mg and sensitivity with respect to temp and time. I have performed experiment in Netzsch DSC/TGA. 

Each equipment manufacturer has own software for data analysis. For example, TA has universal Analysis software; Perkin Elmeyer has different software but the bottom line is all software based on either heat flow vs temperature or heat capacity vs T. So, you can consult with your equipment supplier/manufacturer for the software, good luck.

if for some reason the tool provided software is unavailable or insufficient, you'll probably need to hand code some analysis software.  Assuming the data is in some sort of ASCII format, much of this could be read into GNU Octave or SciLab (both free, open source software, similar to Matlab).  From there you can do whatever plotting or data manipulation is necessary (curve fitting, numerical integration, etc.) to get your DSC results. the basics of DSC analysis should be laid out clearly in the literature, but I'm afraid I don't have a starting reference for you.

Try Origin

There is a Guide text about DSC Data Analysis in Origin here:

http://ctrstbio.org.uic.edu/manuals/dscOrigin.pdf

One of my colleague suggested TA Universal Analysis - This one is free.

The download link for TA Universal Analysis (UA) Software:

http://www.tainstruments.com/support/software-downloads-support/downloads/#tab-1442864986189-3-2

I downloaded TA software. But a problem in the format file open