I know there are other tools that have nice features as well and I have tried some of them, but I always come back to Jaaxy, why? because it is very accurate with the data it provides and is easy to use once you get into it. From SEO to finding available affiliate programs for products to checking my ranks in SERPS It has it all in one package. I love it.
To qualify to appear in the snack pack or the resulting local search pages, your business needs to be verified by the Google My Business service, which involves registering, getting a physical post card from Google with a code, validating the code and setting up perfect NAP (Name, Address, Phone Number) data across your site, Google Maps, and other citation services and directory listings.
However, this does not mean you cannot topple them. It just takes more of an effort in terms of content as your page has to build the trust. That is why you will see the "Google dance" happening for fresh content from a site that is not yet trusted or is not very authoritative. Google gives your page a chance and measures user click-throughs when it pushes you to certain spots in the SERPs and then measures user engagement levels when the traffic hit your site through those positions in the SERPs.