Free and Open Source Invoicing, Expenses & Time-Tracking
A pure PHP library for reading and writing spreadsheet files
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A terminal spreadsheet multitool for discovering and arranging data
An app created to help users manage a budget and purchases
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Source code of the recurrent donations platform Liberapay
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Yahoo! Finance market data downloader
Quickly obtain real-time data of the funds of interest
A nimble options backtesting library for Python
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Free Invoice & Billing Software for Windows & Linux
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Simple Invoicing program for Desktop written in vba and Access