In this post, we’ve gathered tools necessary for the Magento 2 development. There are both free and paid solutions aimed at debugging, extensions development, IDE plugins usage, unit testing, etc.
The following Magento extensions and tools are already available for 1.X, so we are waiting for them to be released on 2.0:
Ultimate Module Creator Magento Extension Commerce Bug 2 modman (Module Manager) Pulse Storm Launcher Magento extension Module List Magento Extension Magento Developer Toolbar FireGento_Debug Magento Debug Toolbar Easy Template Path Hints Magento Extension netz98 magerun CLI tools Magicento
More tools and solutions are described here: Best Tools And Extensions For Magento Developers (debug, extensions development, IDE plugins, data base debug, unit tests)