Check out: ExtendsClass.com (Free Online Toolbox for Developers)

I needed a free XML to JSON converter for one of my previous posts and - via an email (thanks Cyril) - I learnt about this awesome website with an abundance of free Developers/Web designers/Webmasters tools:

https://extendsclass.com/

List of tools below.

Testers:

- Regex Tester

- XPath Tester

- JSONPath Tester

- JSON Schema validator

- XML Schema validator

Code checkers:

- PHP code checker

- Python code checker

- Ruby code checker

- JavaScript tester

HTTP API tools:

- REST client

- SOAP client

- Mock REST API

- Web Service Testing

- JSON Web Storage

Random Data Generator:

- CSV Generator

- JSON Generator

Database tools:

- SQLite browser

- SQL Formatter

Encoders:

- URL encoder and decoder

- Base64 decode/encode

- Base64 image cnoder

- HTML entity decode / encode

Converters:

- XML to JSON / JSON to XML

- JSON to CSV converter

- JSON to YAML converter

- CSV to Excel

Formatters:

- XML formatter

- JSON formatter

- CSV formatter

Compare Tools:

- JSON diff

- JSON Patch

- XML diff

- Text compare

- CSV compare

- PDF compare

Web Designers’ Tools:

- CSS Generator

- Sitemap Generator

- Robots.txt Generator

- Unzip Files

- JPEG Image compressor

Web Formatters:

- JavaScript minifier

- CSS Formatter

- HTML Formatter