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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.
Recently, I stumbled upon ihatemoney.org - a free and open source shared expenses manager and I found it great. It lets you create a group of members to manage settlements between them.
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Hence, a higher number means a more popular project.