The first open source MMP https://openattribution.dev
MMPs collect user data across apps to help apps run ads. This is needed because mobile apps are downloaded without the additional data you could get passed along an HTTP url like you'd see in a regular email marketing campaign or YouTube affiliate link.
My goal is to create a way for mobile apps to self host their advertising attribution, keeping their user data in house and not sharing it to a 3rd party like AppsFlyer/Adjust/Branch. There are only a few companies that do this in the world and NO open source non 3rd party option.
Please reach out if interested, I'd love to chat!