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Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Netbeans - NetBeans IDE 7.0. Develop desktop, mobile and web applications with Java, PHP, C/C++ and more. Runs on Windows, Linux, Mac OS X and Solaris. NetBeans IDE is open-source and free.
Rust - A safe, concurrent, practical language