Equity SIP Returns Simulator: An Indian Context

I was recently asked the question 'If I invest 6k SIP in mutual funds how much can I accumulate in 10 years?' on Quora, a Q&A site. I usually ignore questions like these, because there are a gazillion tools available online that calculate SIP values based on a required rate. Then I realized, there are no tools available, in the Indian context, that calculate SIP values based on historical averages and standard deviations. I'm a big fan of probabilities, reversions to mean and Excel models. So I pushed myself to build one!