Vagrant
Automation virtual machine environment.
Notable plugins
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autoupdate VirtualBox guest additions (according to VB version).
adds an entry to your /etc/hosts file on the host system.
a vagrant provisioner to run commands on the host when a VM boots.
allow provisioning your VM with ansible playbooks directly from the guest VM.
easy manage VM state (commit/rollback while experimenting with software stack).
add "register" and "unregister" capabilities to Vagrant guests for updates on systems with a subscription model(like Red Hat Enterprise Linux).
enable easier access to the features and services provided by the Atomic Developer Bundle (ADB).
Copy files to a Vagrant VM via SCP.
Helpers / Tools
boilerplate to create, develop and deploy a Docker Swarm environment, using Vagrant to reproduce production environment locally.
a tool for easily (and repeatedly) building custom Vagrant base boxes, KVMs, and virtual machine images.
simple command-line tool to manage multiple vagrant boxes
Popular readymade environments
development environment for creating and modifying WordPress sites.
An open source Vagrant configuration focused on WordPress development.
try Yii2 with Vagrant VM + Ansible provisioning = Complete readymade virtual server playground.
run Laravel 4 inside a Ubuntu 12.04 Vagrant Virtual Machine w/PHP 5.5.