The best alternatives to Comma Chameleon are Shuffle for Bootstrap, OneSchema, and Modern CSV. If these 3 options don't work for you, we've listed a few more alternatives below.
Bootstrap Shuffle is a tool to help developers ship faultless projects on time, within a presumed budget and without stress. It maximally accelerates the initial stages of the project so that you have more time and can focus on perfecting the details.
OneSchema is a super simple spreadsheet UI for detecting and correcting errors in CSV data. You can use it when you repeatedly need to upload data to a system with a known schema (like setting up new customers in a SaaS product, uploading a catalog monthly)
Modern CSV is an application for viewing and editing CSV (comma-separated value) files. It has a lot of nifty editing features that can be called by keyboard shortcuts (full customizable) or from the command launcher.
The new JSON Hero Chrome extension lets you easily use JSON Hero from Chrome for plain JSON blobs. Or extract and open Firestore documents, Github files, and Open Graph metadata. And since JSON Hero is open source, you can even point to your own instance.