Google Sheets API -- simple interface to read/write data and manage sheets
Jspreadsheet is a lightweight, vanilla javascript plugin to create amazing web-based interactive data grids with spreadsheet like controls compatible with Excel, Google Spreadsheets and any other spreadsheet software.
Feature-rich JavaScript Spreadsheet (Excel) control with built-in support for selection, editing, formatting, importing and exporting to Excel
An algorithm for resolving imports in Sass
A Complete Microsoft Excel-like JavaScript Spreadsheet for Enterprise Applications