Perl | Natural environment | Integrated development environment | Environment Agency | Department for Environment, Food and Rural Affairs | Secretary of State for the Environment | Environment | environment | Object-oriented programming | Object Management Group | United Nations Environment Programme | unidentified flying object | object | Distributed Computing Environment | Astronomical object | natural environment | Environment Canada | Environment (biophysical) | Secretary of State for the Environment, Transport and the Regions | Object REXX | Near-Earth object | Document Object Model | Component Object Model | Unidentified flying object | Sedimentary depositional environment | Object (computer science) | Nicholas School of the Environment | Messier object | Integrated Development Environment | integrated development environment |
Similar environments written in other programming languages include Node.js for JavaScript, Twisted for Python, Perl Object Environment for Perl, libevent for C and EventMachine for Ruby.