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LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.org Calc, professional data miners and number crunchers will appreciate its comprehensive range of advanced functions.

Google Sheets, part of Google Drive , is an online spreadsheet app that lets you create and format spreadsheets and simultaneously work with other people. Here's what you can do with Google Sheets:

The Gnumeric spreadsheet is part of the GNOME desktop environment: a project to create a free, user friendly desktop environment.

EtherCalc is a web spreadsheet. Your data is saved on the web, and people can edit the same document at the same time. Everybody's changes are instantly reflected on all screens. Work together on inventories, survey forms, list management, brainstorming sessions and more!

Calc, part of the Apache OpenOffice suite, is a spreadsheet application. It is similar to Microsoft Office Excel , with a roughly equivalent range of features. Calc is capable of opening and saving most spreadsheets in Microsoft Excel file format. It provides a number of features not present in Excel, including a system that automatically defines series for graphing based on the layout of the users data. Calc is also capable of writing spreadsheets directly as PDF files. »

NeoOffice is a full-featured set of office applications (including word processing, spreadsheet, presentation, drawing, and database programs) for Mac OS X. Based on the OpenOffice.org office suite, NeoOffice has integrated dozens of native Mac features and can import, edit, and exchange files with other popular office programs such as Microsoft Office.

Fieldbook lets you create a custom tracking database that fits you like a glove.

In Numbers ’09, spreadsheets are built on a flexible, free-form canvas. So you can move tables, charts, graphics, and text anywhere you want on the page. As tables resize, objects automatically adjust to fit around them. Create as many tables as you want. Change fonts, sizes, colors, styles, and borders. With graphics tools, alignment guides, and rulers, spreadsheet-making becomes a surprisingly creative endeavor. And suddenly, spreadsheets make more sense.

Kingsoft Spreadsheets allows users to perform complex data calculation and analysis. The program is compatible with Microsoft Excel (97/2000/2003/2007/2010) and possesses an interface that is similar to the latter. It has a large number of built-in formulas and numerous functions to aid in data analysis. It also has an encryption function, a built-in PDF converter and more. 2000 character descriptionKingsoft Spreadsheets can meet maximum data-analysis needs and provides the quantitative support for your decision making when weighing the alternatives. It provides charts, illustrations, diagrams and other analysis tools, making it intuitive and easier to display your conclusions. Not only is Kingsoft Spreadsheets compatible with Microsoft Excel (97/2000/2003/2007/2010), but also contains unique features to make statistical analyses much easier. »

Spread32 is a mini-Excel with all of the basic features that you would expect in a competent spreadsheet program. Run macros, draw objects, generate charts, calculate functions and formulas, its all here. And it reads and writes xls, csv, text, and pxl formats.

wikiCalc is a wiki-based spreadsheet developed by Dan Bricklin and released under a GPL license. SocialCalc is co-developed with Dan and Socialtext, released under SPL and is being integrated with Socialtext Open.

Obvibase makes it easy to create and collaboratively edit online databases.

ANKHOR is a revolutionary platform for in-memory processing of data from diverse sources and in variable data formats.

Create and share interactive spreadsheets on the web. Allow multiple users to work on a spreadsheet simultaneously. Copy-n-paste from Excel or import an Excel file.You can also export back.

dhtmlxSpreadsheet - JavaScript and PHP spreadsheet software. Integrate Excel-looking interactive tables into your webpages. Access and edit online.