GameDatum.com - A platfrom of free online games. A list of all the available online free games from various producers online.
ARPAY - Buy gift cards at ar-pay.com, which allow you to access your favorite internet services: online games, e-wallets and console games, online shopping cards and many more!
Enjify - Enjify is an online gaming e-store that enables you to buy games for multiple platforms like Nintendo, PlayStation, Xbox, and Steam.
G2A - Enjoy the vast offer of Steam, Origin, Uplay, Battle.net, GOG, PSN and XBOX CD-Keys at the most attractive prices on the market. Don’t overpay – buy cheap on G2A.COM!
Mitch - The unofficial mobile app for itch.io
Kinguin - Marketplace to buy/sell game keys for a myriad of platforms including: Battle.