WP Job Manager is described as 'lightweight job listing plugin for adding job-board like functionality to your WordPress site. Being shortcode based, it can work with any theme (given a bit of CSS styling) and is really simple to setup' and is an app. There are seven alternatives to WP Job Manager for Self-Hosted solutions, Wordpress, Online / Web-based and SaaS. The best alternative is HivePress, which is both free and Open Source. Other great apps like WP Job Manager are phpListings, WPJobBoard, GeoDirectory and Jobroll.
Jobroll - Launch a job board in minutes. Jobroll is the easiest way to create a fully customized job boards. Jobroll is a white label solution that supports custom domains, has integrated monetization options and built-in newsletter / alert system.