GitHub, renowned for facilitating collaborative code version control and software production in software teams, expanded its services in 2017 by introducing GitHub Marketplace. This online platform hosts automation tools to assist developers with the production of their GitHub-hosted projects, and it has become a valuable source of information on the tools used in the Open Source Software (OSS) community. In this exploratory study, we introduce GitHub Marketplace as a software marketplace by comprehensively exploring the platform's characteristics, features, and policies and identifying common themes in production automation. Further, we explore popular tools among practitioners and researchers and highlight disparities in the approach to these tools between industry and academia. We adopted the conceptual framework of software app stores from previous studies to examine 8,318 automated production tools (440 Apps and 7,878 Actions) across 32 categories on GitHub Marketplace. We explored and described the policies of this marketplace as a unique platform where developers share production tools for the use of other developers. Furthermore, we systematically mapped 515 research papers published from 2000 to 2021 and compared open-source academic production tools with those available in the marketplace. We found that although some of the automation topics in literature are widely used in practice, they have yet to align with the state of practice for automated production. We discovered that practitioners often use automation tools for tasks like "Continuous Integration" and "Utilities," while researchers tend to focus more on "Code Quality" and "Testing". Our study illuminates the landscape of open-source tools for automation production in industry and research.