I am sure you are already familiar with the Java IDE (Integrated Development Environment) IntelliJ. There are plenty of other IDEs out there, but here are best that are similar or better.

ReSharper

ReSharper is an IDE that integrates with Visual Studio. It is used by professionals, but it has a free trial for personal use. The features of the ReSharper IDE include an advanced code editor, intelligent code completion, and automated code inspections.

LiteIDE

LiteIDE is a lightweight IDE for Windows, Linux, and Mac. It is designed for easy use and simplicity. LiteIDE has a syntax highlighting editor, a built-in terminal, and a debugger.

Eclipse

Eclipse is a free and open-source integrated development environment (IDE) used in computer programming, web development, and enterprise application development. Its features include an extensible plug-in system, a compiler for programming languages and markup languages, and a software framework for developing cross-platform applications.

Visual Studio

Visual Studio is a set of integrated development environment (IDE) products from Microsoft. Visual Studio is available for Windows and macOS, and is aimed at professional developers. Visual Studio provides a set of integrated tools that can be used to create a variety of applications, from a large-scale application for a major business to a small application for a mobile device. The most common use of Visual Studio is for developing a Windows or web application.

Cloud9 IDE

Cloud9 IDE is an online IDE for web developers. It supports a wide range of languages and frameworks, including Node.js, Angular, React, and Ruby on Rails. Code files are stored in the cloud, so they can be accessed from any computer.

CodeLite

CodeLite is a free, open-source IDE for C, C++, PHP, Python, and a few other programming languages. CodeLite can be downloaded from the website or from the Ubuntu Software Center.

Komodo IDE

Komodo IDE is a cross-platform program that supports Python, JavaScript, Ruby, PHP, Perl, and more. Komodo IDE is free, but the commercial version includes a GUI designer, debugger, and other features.