Deven stands for Development Environment or Development Engine. It’s a command line tool for web developers for creating LAMP virtualhost based development environments in a single command.
WP-CLI is a handy command line tool for WordPress administration that works in the shell. It allows you to make blazing fast upgrades of core WordPress, plugins or themes, new WordPress installations and any kind of administration tasks you usually do over the web administration interface. Actually it offers even a little bit more.