Hi I am looking for Free tool where i can check my spam links which are coming to my site from other website
According to my experience free tools isn't going to cut it.
My thoughts exactly. For these things you need paid tools.
As per my experience Unnatural links indicate that your website might not have the quality. So you can use paid tool like Ahref tool to check your spam backlinks.
You can use Moz tool to check spamscore
For these things ahrefs is the best.