WordPress plugin for monitoring development information like queries, environment variables, etc.
UpDevTools - A suite of developer tools for your WordPress development environment
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.
Netgen's Site API is site building productivity layer for eZ Platform
In your WordPress, developing locally
The Developer Tools Panel for WordPress
Miscellaneous PHP development tools
Module for developer and debug tools for working with the ZF2 MVC layer.
Development tools for WordPress