In your WordPress, developing locally
WordPress Plugin Development Cookbook, Second Edition, published by Packt
Dev and Staging Environment Plugin provides developers with the ability to run separate Dev and Staging environments without having to manually change configuration settings both in the file system and database when migrating between environments.
WordPress plugin for monitoring development information like queries, environment variables, etc.
A plugin for plugin developers. Sister project of Theme Designer.
Tools for developing and running WordPress websites
UpDevTools - A suite of developer tools for your WordPress development environment
[WordPress] A foundation for WordPress Plugin Development that aims to provide a clear and consistent guide for building your plugins.
A WordPress plugin that adds a developer portal for a Tyk API Gateway