We are looking for the first customer to kick start the integration of a spreadsheet component as an APEX region plug-in. We've performed a fair amount of research on the web and this is the best component available.
It's packed full of the most important features you need from a Spreadsheet tool. All the regular functions of the desktop Excel will be available for you (formulas and math, sorting and filtering, editing, various types of data). Your data will be persisted, as we will save all of your data to a table/collection of your choice.
By integrating a 3rd party product we can offer you a great price on something that would be cost prohibitive to develop from scratch. You'll get the features you need without having to try and hack around with the Interactive grid to achieve a subset of the functionality you get "out of the box" with the Webix Spreadsheet. Plus you will continue to get a stream of functionality improvements you don't need to pay for. Since we can re-sell the integration work we perform, we can offer you a much lower cost than what you would be charged to create a plug-in like this.