SEMrush
I use SEMrush to do any competitive analysis research. If you are interested in how your competitors are getting traffic to their websites then you need this tool. Create an account and check it out for yourself.
Shopify
I currently use Shopify for a few e-commerce websites I have built for myself and for my clients. I have tried Magento and a few other shopping cart software but Shopify is the best one I have found so far to use with its ease of use and plenty of add-ons. Create an account and check it for yourself.
MOZ
I have used MOZ since 2010 and I use this for doing research into competitors link acquisition strategies. I also perform social media research through their tool Followerwonk. Create an account and check it out for yourself.
Ahrefs
I have used Ahrefs since 2011 and I use this for doing research into competitors link acquisition strategies. I also use it to find outreach link propects. Create an account and check it out for yourself.
Buzzsumo
I have used Buzzsumo since its inception and this is a great tool to track the types of content that is performing well on social and this can be also used for competitive analysis research. Create an account and check it out for yourself.
Screaming Frog
I have used Screaming Frog since 2011 and I use this for performing technical audits for the websites I am consulting on. Check it out for yourself.