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Spreadsheets freeware

ClosedXML makes it easier for developers to create OpenXML files for Excel 2007. It provides a nice object oriented way to manipulate the files (similar to VBA) without dealing with the hassles of XML Documents. It's developed in C# but can be used by any other .NET language.
http://closedxml.codeplex.com/
Gantt Excel
Free Excel workbook to create gantt charts
http://sites.google.com/site/ebuilderstools/home/gantt-excel/
SQLite for Excel
SQLite http://www.sqlite.org is a small, easy-to-use, open-source SQL database engine. SQLite for Excel is a lightweight wrapper to give access to the SQLite3 library from VBA. It provides a high-performance path to the SQLite3 API functions, preserving the semantics of the SQLite3 library calls and allowing access to the distributed SQLite3.dll without recompilation.

http://sqliteforexcel.codeplex.com/
OFX2CSV (OXF, QFX Converter to CSV) utility is small useful application to convert OFX (MS Money) or QFX (Quicken) files to CSV (Comma Separated Value) format (Excel compatible).
http://ofx2csv.propersoft.net/
Excel Sheets Separator
Split Excel sheets in separate files.
http://www.filecluster.com/Business-Office/Office-Suites-Tools/Download-Excel-Sheets-Separator.html
Matrex is a vectorial spreadsheet. It is better than usual spreadsheets when working with large amounts of data coming from databases, files, or networks. It is strongly multithreaded, expandable, and improves readability. It has adapters to Matlab, Scilab, Octave, and R.

http://freshmeat.net/projects/matrex
Excel2GED
This is a genealogy Excel spreadsheet with a macro that will convert the spreadsheet to GEDCOM format. It differs from other similar solutions in that the conversion preserves family relationships.
http://www.freewarefiles.com/Excel2GED_program_49311.html
NodeXL
Network Overview, Discovery and Exploration for Excel
http://nodexl.codeplex.com/
Excel Data Reader
Excel DataReader (aka Xls to DataTable) is a lightweight and fast .NET 2.0 library written in C# for reading Excel files.
Cross-platform ready.
http://exceldatareader.codeplex.com/
DMcsvEditor
Simple CSV (text database) files editor. Supportes valid separators: comma and semicolon.
http://www.freewarefiles.com/DMcsvEditor_program_16899.html
OLAP PivotTable Extensions is an Excel 2007 add-in which extends the functionality of PivotTables on Analysis Services cubes. The Excel 2007 API has certain PivotTable functionality which is not exposed in the UI. OLAP PivotTable Extensions provides an interface for some of this functionality. It can be launched from the following menu option in the right-click menu for PivotTables:
http://www.codeplex.com/OlapPivotTableExtend
NodeXL is an Excel 2007 template for viewing and analyzing network graphs, along with a set of .NET Framework 3.5 class libraries that can be used to add network graphs to custom applications. NodeXL used to be called ".NetMap".
http://www.codeplex.com/NodeXL
Excel Macros Toolkit
The Excel Macros Toolkit (EMT) enhances the way engineers write Excel applications. Financial institutions that use intensively such applications may find it very useful as they produce lots of macros that are hard to maintain.

http://www.codeplex.com/emt
SQL Excel
Excel Add-in to simplify data retrieval from SQL Server, Oracle, MySQL, and any other ODBC compliant database.
http://www.sqlexcel.net/
powerutils
Excel add-ins
http://www.powerutilsnet.com/HTML/index.html
Matrex is an un-spreadsheet that is useful for working with vectors (for example, database data and charts) and matrices. It is the perfect desktop tool for mathematical, statistical, and engineering models and for other complex calculations. It has adapters for Matlab, Scilab, Octave, and R.

http://freshmeat.net/projects/matrex/
Abykus
A free spreadsheet program designed for business and scientific applications.
http://www.freewarefiles.com/Abykus-SE_program_28281.html
TXT2CSV
Conversion program for plain text file to CSV (Comma Separated Value) file.
http://www.freewarefiles.com/program_9_96_16139.html
CSVed
An easy and powerful CSV file editor.
http://www.freewarefiles.com/CSVed_program_15767.html
Batch Replacer for MS Excel
Is an utility which helps to make a multi-replacement operations in MS Excel files with the help of ...
http://www.softpedia.com/get/Office-tools/Other-Office-Tools/Batch-Replacer-for-MS-Excel.shtml
Excel Function Dictionary
Examples of over 150 Excel functions.
http://www.freewarefiles.com/Excel-Function-Dictionary-V_program_25077.html
DMcsvEditor
CSV (Comma Separated Values) editor.
http://www.freewarefiles.com/program_9_96_16899.html
XL-EasyGantt
Free Excel Project Scheduling and Gantt Chart Template.
http://www.freewarefiles.com/XL-EasyGantt-V_program_22736.html
Excel List Compare
Excel macro compares row equality of 2 lists based on 1 to 4 columns
http://www.softpedia.com/get/Office-tools/Other-Office-Tools/Excel-List-Compare.shtml
Business Functions Basic Edition
Excel financial add-in
http://www.versiontracker.com/dyn/moreinfo/win/24024
http://www.freewarefiles.com/program_8_84_26730.html
Hands AddIn for Excel
The AddIn for your ´hints´ in your Excelsheets.
http://www.freewarefiles.com/program_8_182_18247.html
CleanSheets is a spreadsheet application that is both extensible and platform-independent. It features a formula language that closely resembles that of Microsoft Excel, and extensions for aiding end-user programmers in developing correct spreadsheets. The application is based on the ANTLR compiler generator and uses the JFC/Swing JTable component for spreadsheet visualization.

http://csheets.sourceforge.net/
Excel Invoice Template
An Excel Invoice template provides a Fill In The Blank invoice form.
http://www.freewarefiles.com/Excel-Invoice-Template_program_15307.html
http://www.versiontracker.com/dyn/moreinfo/win/55871
Gnumeric is a powerful and easy to use spreadsheet using GNOME. Its goal is to provide a full featured spreadsheet and a smooth migration path for people and organizations currently using proprietary applications. It provides more sheet functions and greatly improved accuracy when compared to Microsoft's Excel. A plugin system lets you extend Gnumeric, adding functions, I/O formats, and real time data capabilities. The existing Python, Guile, and Perl plugins let you define complex functions. Gnumeric is capable of reading and writing MS Excel, and reading Lotus, Applix, Quattro Pro, OpenCalc, XBase, DIF, SYLK, HTML, Psion, MPS, oleo, sc, misc. text formats, and its native XML. It can also generate Latex, HTML, and others.

http://freshmeat.net/projects/gnumeric/
http://www.gnome.org/projects/gnumeric/
Morefunc
A free library of 50 new worksheet functions for Excel.
http://www.freewarefiles.com/Morefunc_program_14922.html
Excel Name Manager
If you need a free utility to manage defined names in your workbooks, this one is a must-have. List all names in your active ...
http://www.sofotex.com/Excel-Name-Manager-download_L21573.html
Pivot Table Helper
Makes working with pivot tables comfortable and fast. Pivot Table Helper adds its own toolbar to Excel that ...
http://www.sofotex.com/Pivot-Table-Helper-download_L19762.html
Simple checkbook for Excel or Works. Freeware
A simple checkbook register. Requires MS Excel, MS Works or Sun's Star Office. There are no bells & whistles. It exactly emulates a paper checkbook register, except of course it does the math. Very easy to use.
Joe Barta, http://www.pagetutor.com/checkbook/.