Python

easy to install. Very complete to make developments.

Excellent code editor. Powerful refactoring, superb code completion, and may more help it come at the best. Pycharm Community is also excellent.

Amazing code editor. I compared it with spyder and visual studio. Spyder was the worst. According to me, the intelligence of Pycharm is not available in either: Spyder or Visual Studio. Visual Studio is good, but I recommend Pycharm.

Plenty of plugins to extend basic functionality, simple configuration that can be done in both config files and in command line.

Great. Two years later and I still use it.

the portabiity, it just works in all places

Thanks to Doxywizard it is very easy to quickly get started, even if I haven't used it for a long time.