GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
CodeAbbey - Programming problems to practice and learn for beginners
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
Coderbyte - Coderbyte is a place built for anyone to practice and perfect their programming skills.
StackHive - Design, develop or publish websites right from your browser
Codewars - Achieve code mastery through challenge.