There are several, but it is dependent on what you want from your scripting tool.
Scriptrunner is the most powerful, with scripts that make direct calls to anything Jira exposes as an API, and pretty much any code you want to support those calls. But you do need to learn a bit about the internals of Jira and how to code.
Powerscripts insulates you from having to fully understand Jira, but to give the full range of "easy" access, it has to work within what it can do with Jira, limiting it a bit, and you have to learn yet another language
I'd also look at Automation and keep an eye on the two new "visual" script apps on the way to cloud (Drag and Drop Automation and Autoblocks). Again, a bit less powerful, but a lot easier to "code" with.
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