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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.
All software costs money to make and maintain. Allot of things that are 'free' like gmail are making money by mining your data, or they have limited features and want you to pay to upgrade. Then there is opensource software that is free and the code gets peer reviewed, so you can trust its not spy ware. I have seen people use gnucash its free and opensource. https://www.gnucash.org/ also more sophisticated packages are Sql-ledger https://sql-ledger.com/ and Ledgersmb https://ledgersmb.org/
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