All assets that are used in Gridfolio are free for personal and comercial use.
All icons used in Gridfolio template come from open source icon library - Feather icons. Meaning they are are free for personal and commercial use.
Gridfolio is using two additional fonts: Sentient and Satoshi. Both of them can be downloaded at Fontshare. Both of these fonts are 100% free for personal and commercial use.