Open Source Windows Spreadsheet Software

CryptPad is an open-source, end-to-end encrypted collaborative office suite developed by XWiki SAS. It offers a privacy-focused alternative to mainstream cloud-based productivity tools, enabling users to create, edit, and share documents securely without compromising data privacy. All content is encrypted client-side, ensuring that only authorized users can access the information. CryptPad supports various applications, including rich text documents, spreadsheets, presentations, code editing, kanban boards, polls, and whiteboards, facilitating real-time collaboration among teams. Users can access CryptPad without creating an account, and the platform also offers self-hosting options for organizations seeking full control over their data.

Free Java Office suite on the Web.

You want to render an Excel file inside web browsers and allow users to edit information in cells... Workbook Tag has been designed to simplify this scenario. MSOffice is not required ! Ajax interact with server (Excel, Editor, Tag, HTML Converter, JSP)

Keep you costs on your mobile device. Quick add, edit, remove costs, multiple currencies, reports, filters.

SameDesk is a common workspace for web applications. Supporting applications written in AJAX, Java, Flash, & Server-generated HTML, it lets applications across domains work together for the users via a familiar window GUI delivered via web browsers.

A Simple contact management system, aka browser based rolodex. Includes mass mailing of html mime messages to contact lists, export to csv, Fulltext boolean searches, etc. Requires: PHP >= 4.3.1 (with register_globals OFF) & MySQL >= 4.0.1

iTelliHashExcel is a cryptographic “one-way” hashing application designed to securely protect sensitive or private information from disclosure. Proper use of this program allows organizations, businesses, and individuals (i.e., the data owners) to share complete/intact datasets containing sensitive data with others without actually disclosing the sensitive or private information. Additionally, if such datasets are subsequently modified or enhanced through value-added services or products provided by other organizations or individuals and then returned, the data owner retains the ability to “re-map” the hashed sensitive data values back to their original values.