Blog software, also known as weblog software, blogging software, or blogware, is software designed to simplify creating and maintaining weblogs. As specialized content management systems, weblog applications support the authoring, editing, and publishing of blog posts and comments, with special functions for image management, web syndication, and post and comment moderation.

Un moteur de blog est un logiciel qui permet de réaliser des sites web basés sur le principe du blog. Il fait partie des systèmes de gestion de contenu (CMS).