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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.
Try https://ledgersmb.org. We are moving to this open source platform and will self-host. You can have it hosted however. It is less complex than Odoo and yet full multi-user and full-on double-entry accounting -- including for us the all-important project accounting (which is helpful especially for client expense reimbursement).
NOTE:
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Hence, a higher number means a more popular project.