Hi Prasad, it really depends on what you're trying ot integrate from AgileCRM and what mechanism is availble to move data about. I can' find a great deal on their website at a glance, but it's clearly possible, as there are setup guides for Magento and Shopify etc. I'd start there to see what is available. The map out what you want to integrate interms of which entities in Kentico relate to which entities in AgileCRM and what workflows need to be applied.
After that, I would recommend codeing your implementation using Kentico's integration bus. I can't see anything on the Kentico marketplace specifically for Agile CRM, but there is the CRM Connect extension, which may also be worth looking into.