The document discusses the modern developer toolbox and outlines various tools that developers can use for development environments, testing, debugging, profiling, deployment, logging, and monitoring of applications. It provides recommendations for setting up development environments on different operating systems and with tools like Vagrant, Docker, Ansible, and Homebrew. It also discusses PHP installation and editors/IDEs to use. Testing with PHPUnit, Behat, and Jenkins is covered as well as debugging with XDebug, profiling with XHProf, and deployment with Ansible, Capistrano and other options. Logging with Monolog, Logstash and Kibana is also summarized along with monitoring metrics with StatsD, Graphite and Grafana.