Jira offers several built-in conditions, validators, and post functions that help you configure workflows. However, these native tools are often not enough for automating processes using workflows.
Using Jira Misc Workflow Extensions (JMWE) and its 40+ point-and-click post-functions, conditions, and validators, you can quickly configure thousands of sophisticated use cases. You can find all these extensions right within Jira's list of post-functions, conditions, and validators.
These cheat sheets list all of the Jira and JMWE extensions available to you in Jira Cloud [PDF], Jira Data Center and Server [PDF].
Read this guide to learn more about Jira Misc Workflow Extensions (JMWE).