I am looking for spme of the best tools for code coverage. Please help me.
There are a lot of open source code coverage tools that support different programming languages. In fact many of them are also used as QA tools. 
While deciding on the best tool to use, you should consider features and if there is an active development of the tool. Here are the best tools that you can consider, 
1. Coverage.py
2. Serenity BDD
3. JaCoCo
4. JCov
5. PITest
6. Quilt
To learn more about these tools in detail you can refer the blog here
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