Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Elixir - Dynamic, functional language designed for building scalable and maintainable applications
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Rust - A safe, concurrent, practical language
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.