What is "intellij-idea"

Intellij IDEA is a popular IDE created by Jetbrains. He is also often called idea or intellij. This IDE is paid for, but is available through a trial version (Ultimate) that works by 30 days or through the community version (Comunity Edition) which is free and open-source, both are available on various platforms.

The Ultimate (commercial) version of the tool provides development support at the enterprise level, while the open-source version is generally used for development for Android and Web.