I used this add-on in a lot of websites. I really like it.
fabianbitter
A quick and simple way to add a back to top link on your website.
Coffee helps me code, if you find this addon useful then why not buy me a coffee :)
Reviews
I feel leaving a review leads to a better marketplace. Please leave a review and help the developers develop better addons for Concrete 5.
I've added this project onto Github https://github.com/edbeeny/hw_back_to_top