EOS Integration Kit is Free and Open-Sourced - GitHub - betidestudio/EOSIntegrationKit: EIK (Epic Online Services Integration Kit) is a plugin that enables seamless integration between Epic Online Services (EOS) and Unreal Engine. The plugin provides access to the EOS SDK (Software Development Kit) within Unreal Engine, allowing developers to easily implement features such as matchmaking, achievements, leaderboards, and more.
Using EOS either required you to know C++ or use Plugins costing 90$+, but no more.
https://dev.epicgames.com/community/learning/tutorials/7BLn/unreal-engine-eos-setup-in-blueprints