CustomPress is described as 'is designed to help you create custom post types, taxonomies and custom fields with ease making WordPress a more robust CMS'. There are five alternatives to CustomPress for Self-Hosted solutions and Wordpress. The best alternative is Advanced Custom Fields, which is free. Other great apps like CustomPress are Pods Framework (Free, Open Source), Toolset Types (Paid), Carbon Fields (Free, Open Source) and Custom Field Suite (Free, Open Source).
Advanced Custom Fields helps you create data in WordPress with the flexibility of a professional Content Management System. WordPress is designed for blogging, ACF extends it with powerful custom content and a UI to make it dead easy.
Custom Field Suite (CFS) is a visual custom fields management plugin for WordPress. CFS includes over 12 field types, include text, date, wysiwyg, file upload, relationship, user, and loop (repeatable fields).