Literature faces the lack of studies relating which characteristics of the Scrum framework are adapted. Understanding such variations is useful for prospective software development projects and guiding teams at conducting Scrum customizations. We aimed at identifying how the Scrum framework has been adapted to the context of Agile software development projects and how adaptations might be represented to aid researchers and practitioner at analyzing Scrum processes deployed or to be deployed. We carried out a systematic mapping study in five electronic sources, 11 journals and 15 conferences/workshops. We submitted the 281 returned studies to various filters, which resulted in 50 studies with data extracted, analyzed, and quality evaluated. SMS provides a panorama on the Scrum characteristics adapted to roles, events, and artifacts. We decided to adopt feature models for hierarchically accommodating found Scrum adaptations as it supports adaptations in the form of variability. We evaluated the resulting feature model with practitioners from different companies in the perspective of Perceived Usefulness and Perceived Ease of Use considering the Technology Acceptance Model (TAM). Therefore, we demonstrated the produced feature model aids users to better visualize and understand the documented Scrum adaptations. The panorama on Scrum adaptations and the problems during Scrum adoption are discussed to providing a means to practically understand and tailor (configure) such adaptations. Such adaptations are an essential source of information on the variety of Scrum elements, thus researchers and practitioners may take the results of this work as a guide to understand how different adaptations occur in different contexts during software development. In addition, the conceived feature model is an important asset to guide such users at selecting Scrum characteristics and respective adaptations to perform. The feature model also promotes reuse of knowledge gathered up from several different information sources.