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moneymanagerex
Money Manager Ex is an easy to use, money management application built with wxWidgets
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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.
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MoneyManagerEx - standalone budgeting application
Firefly III - self-hosted budget website
Actual - self-hosted server with desktop app. Used to have mobile apps when this was a company, but not sure those work now.
I'll vouch for Buckets. Though I've never actually used YNAB, but I use the YNAB rules and Buckets can do that just fine.
NOTE:
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Hence, a higher number means a more popular project.