Semrush is company that give the use access to research keyword , backlinks analysis , competitor analysis and many more. They program do not require to download software and need subscribe to use it.
Because black friday festival occur US couple of weeks ago, they (semrush) giveaway free coupon for PRO plan for 30 days, usually they need credit card information submission for trial version of PRO plan. but now is different . completely do not require Credit card Information.
Here the Coupon code : TGCAFE-3P4521TY
or you can access the code with this url : Click here
i don't know when this offer expires , but i just check it and still available. So grab it now ^.^ .