Simple Directory is described as 'creates a custom post type (Listings) with the following fields:'. There are three alternatives to Simple Directory for Wordpress, Online / Web-based, Self-Hosted solutions and Windows. The best alternative is HivePress, which is both free and Open Source. Other great apps like Simple Directory are Link Library (Free) and Simple Link Directory (Freemium).
This directory plugin lets you create unique, responsive, one page link directory that you can show on any page, anywhere with short codes. It is an advanced Link Manager. It can also be used to create nice looking partners, associates or affiliates Directory for your company.