Added more MOOC platforms and DEV platform

Author: HarshVadaliya

web-tools.md

@@ -32,6 +32,7 @@
 [Choose an License](https://choosealicense.com/) | An open source license protects contributors and users. Businesses and savvy developers won’t touch a project without this protection.
 [Cloudping.info](https://cloudping.info/) | A website that allows you to measure latency from your browser to different data centers of major cloud providers such as AWS.
 [CodeAbbey](https://www.codeabbey.com/) | Website that contains collection of programming problems to practice solving, learn to program and code, and win certificates.
+[Codecademy](https://www.codecademy.com/) | Codecademy is an online interactive platform that offers free coding classes in 12 different programming languages including Python, Java, Go, JavaScript, Ruby, SQL, C++, C#, Swift, and Sass, as well as markup languages HTML and CSS. Freemium model. Courses are free but certificate or degree after completion is paid.
 [Codeclimate](https://codeclimate.com/) | Online code quality metrics analyzer
 [CodeChef](https://www.codechef.com/) | Code-Chef is an online competitive programming community of global programmers.
 [Codeforces](https://codeforces.com/) | Codeforces is a website that hosts competitive programming contests and helps you so much in Problem Solving.
@@ -66,12 +67,14 @@
 [DeployBot](https://deploybot.com/) | Instantly build and ship code anywhere in one consistent process for your entire team.
 [Deployer](https://deployer.org/) | A deployment tool for PHP.
 [Deta](https://www.deta.sh/) | Build and deploy applications for free, forever.
+[Dev](https://dev.to/) | Dev.to is a blogging platform where developers publish articles on topics that help other developers solve a problem or learn something new, stay up-to-date and grow their careers. Dev.to serves as a community of software developers getting together to help one another out.
 [DevDocs](https://devdocs.io/) | API documentation and works offline.
 [DevHints](https://devhints.io/) | Rico's cheat sheets.
 [DevHub](https://devhubapp.com/) | TweetDeck for GitHub. See repo activities and manage your notifications by creating columns with filters, saving items for later and more.
 [DiffNow](https://www.diffnow.com/) | Very useful for comparing codes, files, folders or urls.
 [DigitalOcean](https://www.digitalocean.com/) | It make it simple to launch in the cloud and scale up as you grow—whether you’re running one virtual machine or ten thousand.
 [Dillinger.io](https://dillinger.io/) | Is an online markdown file editor with a preview that can help you to create or edit .md file for your project
+[edX](https://www.edx.org/) | edX is an American massive open online course provider created by Harvard and MIT. It hosts online university-level courses in a wide range of disciplines to a worldwide student body, including some courses at no charge. It also conducts research into learning based on how people use its platform.
 [Epoch Converter](https://www.epochconverter.com/) | Convert epoch to human-readable dates and viceversa
 [ERDPlus](https://erdplus.com/) | A database modeling tool for creating Entity Relationship Diagrams, Relational Schemas, Star Schemas, and SQL DDL statements.
 [Etherscan](https://etherscan.io/) | Etherscan is the leading BlockChain Explorer, Search, API and Analytics Platform for Ethereum, a decentralized smart contracts platform.