SmallDevTools - Handy developer tools with a delightful interface
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools
StackHive - Design, develop or publish websites right from your browser