This app emails its users with JIRA tickets that they filed 1 year ago that are still unresolved.
In order to use this in your own JIRA workspace, you'll need to fork the app and provide OAuth credentials for both JIRA and Gmail.
Your coworkers can provide their JIRA credentials via the settings page of your app, and you can create a scheduled task that runs the run_for_all_users operation each day.