CodePen

https://codepen.io/

Functionality: A Web browser-based sandbox for front-end Web development, with markup options for Haml, Markdown, etc., stylesheet options for Sass, LESS or Stylus, and scripting options for JavaScript, CoffeeScript or LiveScript. Use for prototyping new ideas, reduced test cases for bugs, sending clients things to look at, evaluating potential hires, to finding inspiration. People also use CodePen as a sort of resume and portfolio, showing off their best design and development work.

System Requirements: Works on most web browsers.

Activities Supported:

Delivery Methods Supported: Supports writing and testing front-end code.

Subject Applicability: Computer Science

Security Concerns: None

Pricing Model: Free, but has 3 annual subscription options.

Coderwall

https://coderwall.com/

Functionality: "Programming tips, tools, and projects from our developer community. A collaborative learning platform for software developers." This platform specifically provides support and resources for Ruby, Python, JavaScript, and Front-End. It is a combination of stackoverflow and reddit.

System Requirements: Works on most web browsers.

Activities Supported:

Delivery Methods Supported: Supports tutorial and practical work

Subject Applicability: Computer Science

Security Concerns: None

Pricing Model: Free

Code Wars

https://www.codewars.com/

Functionality: Codewars is a community of developers, who are called Code Warriors (or just warriors), that train on improving their development skills. Think of it like a coding dojo - where developers train with each other and help each other get better through practice. Read more on their wiki page: https://github.com/codewars/codewars.com/wiki/About-Codewars

System Requirements: Works on most web browsers

Activities Supported:

Delivery Methods Supported: Supports coding practice

Subject Applicability: Compute Science

Security Concerns: None

Pricing Model: Free, but requires an account to be created.

CodingBat

https://codingbat.com/java

Functionality: Website with coding activities for Java and Python. Gamifies programming.

System Requirements: Works on most web browsers.

Delivery Methods Supported: Supports learning how to program

Subject Applicability: Computer Science

Security Concerns: None

Pricing Model: Free

Ideone

https://ideone.com/

Functionality: Ideone is an online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages.

System Requirements: Works on most web browsers.

Delivery Methods Supported: Supports programming

Subject Applicability: Computer Science

Security Concerns: None

Pricing Model: Free

ScienceDirect

https://www.sciencedirect.com/

Functionality: A database that focuses on scientific and medical research. This provides access to journals, articles, book chapters, and open access content.

System Requirements: Works on most web browsers.

Delivery Methods Supported: Research

Subject Applicability: Subjects related to science

Security Concerns: None

Pricing Model: Free access provided by University.

W3 Schools

https://www.w3schools.com/

Functionality: Provides tutorials, references, examples, and exercises for HTML, CSS, JavaScript, Python, Java, C++, Machine Learning, and more. Phenomenal resources for self learning, reference, and review.

System Requirements: Works on most web browsers.

Delivery Methods Supported: Provides supplementary material to coding material

Subject Applicability: Computer Science

Security Concerns: None

Pricing Model: Free