Powershell ISE is described as 'The Windows PowerShell Integrated Scripting Environment (ISE) is a host application for Windows PowerShell. In Windows PowerShell ISE, you can run commands and write, test, and debug scripts in a single Windows-based graphic user interface with multiline editing, tab completion' and is a IDE in the development category. There are four alternatives to Powershell ISE for a variety of platforms, including Windows, Linux, Mac, Web-based and Chrome OS apps. The best Powershell ISE alternative is Visual Studio Code, which is free. Other great apps like Powershell ISE are Lapce, PowerShell Studio and PowerShell Plus.
Free and extensible code editor with built-in Git support, smart IntelliSense, integrated debugger, 30,000+ extensions, works offline, supports markdown and syntax highlighting for numerous languages.
PowerShell Studio is the premier editor and tool-making environment for PowerShell. This single tool will meet all your scripting needs. Work the way YOU want with PowerShell.
PowerShell Plus is an Integrated Scripting Environment (ISE) which includes unique features like an interactive learning center, hundreds of pre-loaded scripts from the QuickClick Library, and other useful features.
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Visual Studio Code offers a good support of PowerShell (through extension). It provide integrated terminal, debugger and even a "PowerShell ISE" mode that mimics the look and feel and behavior or PowerShell ISE. Official documentation of PowerShell feature : https://code.visualstudio.com/docs/languages/powershell