Does its job and does it really, REALLY well!

This is one of those single-task, no BS, no fluff plugins that takes on one job and does it exceptionally well, providing every single possible option offered in WordPress core to register custom post types and custom taxonomies, all packed up in an extremely simple to use and intuitive UI. And if you want to register CPTs and taxonomies using code, it’ll even generate the code for you to use in your plugin or custom code snippet. Another great feature is the way it shows you a handy list of all options configured when you create a CPT or taxonomy with it, so that you can then use it as a reference when hand-coding your own CPTs or taxonomies. Furthermore, the support is very prompt and helpful, especially for a free product. Kudos to the developer!