GemBox.Spreadsheet is a free, easy-to-use .NET component that enables developers to read, write, and convert spreadsheet files (XLSX, XLS, ODS, CSV, and HTML) from their .NET applications.
Devanagari Keyboard is a computer program that allows users to input text in the Devanagari script, the native script of Hindi and other languages in the Indian subcontinent.
<p>OpenOffice is an open-source office suite that provides a powerful set of tools for creating and editing documents, spreadsheets, presentations, and more.</p>
A knowledge base that utilises local Markdown files is called Obsidian. Additional platforms include Windows, macOS, Linux (Snap), and Linux (Flatpak).