ISE is a rich editing environment that includes IntelliSense, built-in help, syntax checking, debugging, and so on.
Additional features are available for ISE from the following add-on tools website:
If you are developing code for use on production systems, I strongly recommend adding PS Script Analyzer. PS Script Analyzer will highlight areas of your code that do not conform to its rule set; for example, using an alias instead of a command name would be highlighted.
Community and commercial add-ons can greatly extend the functionality of ISE to simplify day-to-day use.