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XLS/Loader is a user-friendly, Java™-based GUI tool that quickly and easily transfers a MicrosoftExcel worksheet — provided it is structured as simple table — into your RDBMS (supports Oracle™, MariaDB/MySQL™, and PostgreSQL). Requires at least Java™ 11.
JExcelApi is a java library which provides the ability to read, write, and modify MicrosoftExcel spreadsheets. This project mirrors the files on http://www.jexcelapi.org, which has been known to go down on occasion.
Expr4J aims to provide a general purpose expression parser, which is also compatible with MicrosoftExcel. It will provide an implementation of the built in functions in MS Excel as well as a calculation engine.
This program converts, compares, merges, normalizes, and refactors data to and from disparate sources (CSV, Excel, and any JDBC/ODBC database) for use in a Java program.
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CleanSheets is the first spreadsheet application that is both extensible and platform-independent. It features a formula language that closely resembles that of MicrosoftExcel, and extensions for aiding end-user programmers develop correct spreadsheets.