Handsontable
JavaScript data grid with a spreadsheet look & feel
...When you work with Handsontable, it's like you're working with Excel or Google Sheets. There's no steep learning curve – you can start working effectively from day one. Handsontable is easy to implement, flexible, and super customizable. You can extend it with custom plugins and edit the source code to adjust it to your product. Plus you get access to a comprehensive API, useful tutorials, and both community and commercial support. You can finally work with large volumes of data without worrying about performance issues. Large companies and startups across industries use Handsontable to build applications critical to their business.