PixFields offers you a nice interface to add custom metadata into your favorite post type.

Author:PixelGrade (profile at wordpress.org)
WordPress version required:4.9.0
WordPress version tested:5.2.0
Plugin version:0.7.0
Added to WordPress repository:02-03-2015
Last updated:31-05-2019
Rating, %:0
Rated by:0
Plugin URI:http://pixelgrade.com
Total downloads:14 853
Active installs:4 000+
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