JetBrains IDEs
IntelliJ, WebStorm, PyCharm: deep refactoring and analysis.
A family of per-language IDEs with advanced refactoring, code inspections and debugging. There are free (Community) and paid editions.
When to use
For large projects in one main language (Java, Kotlin, Python, JS) where refactoring and analysis make a difference.
When to avoid
On low-memory machines or if you only edit loose files; most of the IDEs are paid.
Alternatives
They do a similar job. Compare before choosing.
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