Sachin, there are many tools you'll be advised to consider, from Hubspot, Marketo, to Salesforce, and others. However those are great tools, the price for suite like solution might be bit too steep for some SaaS companies.
Alternative for SaaS companies regardless their size and location is Leady.com
Leady.com bring website tracking, lead generation, lead nurturing and lead management as well as customer intelligence into one platform.
Once Leady.com capture business visitor at your website, it will enrich the IP with following data:
You will know from where your business visitors came to your website and what actions they took on your website. Leady.com report:
What makes Leady.com is the ability to track behavior of your newsletter recipients and app users. Overall provide SaaS companies with detail analysis on user behavior so they can prevent churn.
Try Leady.com for 14 days for free, no credit card required and in case you would have any question, just shoot them. I'm here to help, so you can make the most of your trial.