Plenty of good quality Drupal video tutorials are available on this site. It was previous subscription based but recently became FREE.
A site collecting cheatsheets for a number of different languages - PHP, jQuery, CSS, JS, HTML, MySQL, Linux...
Have local, development & staging sites reference the files hosted on your production server.
A nice regex editor which not only lets you test your regex code but also includes a PHP & JS code generator, regex debugger and unit test feature.
Introducing 'The Flexbox Layout' CSS module. It's a new layout mode (eg. block, inline) for advanced layouts, with powerful tools for distributing space and aligning content.
A post detailing how to set up offsite backups using the Backup and Migrate module in conjunction with NodeSquirrel (who are offering free backups up to 5GB for one site).
A good intro on running Drush commands on your local server but executing them on a remote server through Drush aliases
A comprehensive tutorial detailing the workflow.
A collection of links to resources related to performance optimisation for Drupal
This free service keeps track of available updates for your sites modules & core. There is also a daily/weekly email overview if you want it.
Use Drush to quickly test your patches before actually submitting them to Drupal.org
This site provides a quick and easy-to-use command reference for Drush users. It includes support for Drush 5, 6 & 7.
Docker is a popular virtualization tool. This post discusses using a basic docker framework to facilitate your development processes.
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Automate and streamline your build-test-release cycle for continuous delivery. Use Go to model failing fast, artifact promotion, self-service environments and single-click deployment.