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hyperswitch
An open source payments switch written in Rust to make payments fast, reliable and affordable
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lago
Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Also, hyperswitch feels like a simple switch but there is lot of things going behind the scene to make things work - pls check out our GitHub - will be happy to get your feedback & contribution.
It's totally fine if you do not match up to your competitors now. After all you have just launched. But you need to be clear about the positioning and capabilities of your product vis-a-vis your competition. You can check out how https://www.getlago.com/ is doing it. They are quite clear in their positioning and their entire product is open source. It doesn't make sense to open source only part of your product. Either go all the way or don't.
https://killbill.io/ (Open source)