Sources

Some sources of images, icons, content and anything else may require for the user of the item to link to the creator's site or social media profile in order to use it. 2.1 Studios respect this requirement, and we try our hardest to make sure that all items requiring this credit get given the credit. If you believe your content has been stolen without giving credit, please contact us and we will add credit as soon as possible. 

Below is credit to all the items that we know that require credit.

Icons - Icons8

The majority of the icons on this site are imported from the free icon and vector art library, Icons8. Icons8's website address is https://www.icons8.com.

End of list.