Here are some of the resources that I have found, these are not featured on the main Websites page as you have to pay for them.
Some of them are one time purchases and others are subscription based.
I will only comment on the ones I have used and all opinions are my own.
Twinkl is mostly a primary resource and does have a lot of free resources on there.
I have used this site for low set year 7 and 8 and found it to be more appropriate. All of the resources I have used have been engaging so far and have saved me planning time.
Twinkl offers different levels of membership and is good value for money.