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Wondy.
The $0 finance stack
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4 Open-Source GitHub Repos for Your Money (Budget, Stocks, Portfolio)
I screened 9 GitHub repos that promise to replace paid finance apps and kept 4: Firefly III for budgeting, Ghostfolio for portfolio tracking, yfinance for stock data, and OpenBB for research. Star counts and last-commit dates verified on July 13, 2026, plus what each one actually does, how to start, and the catches (hosting, API keys).