The main objectives of the study were to identify key features of the digital library management system (DLMS) for developing and managing digital libraries, to reveal the satisfaction level of the library professionals in using digital library management system, and the problems being encountered in using these systems. The current study was quantitative in nature as quantitative measures were applied through a survey research strategy. Keeping in view the nature of the study, a purposive sampling technique was used to collect data from the target librarians who had been involved in operating digital library systems for building digital libraries in their respective libraries. Descriptive and inferential statistical tests were used to analyze the data. Findings revealed that in most of the university libraries in Pakistan, free and open source software (FOSS) had been implemented. DSpace was the most widely used software by library professionals in Pakistan. Key features of the digital library software included a user-friendly interface, customization, reliability and security, use of metadata standards (Dublin Core), web-based, advanced searching, consultancy and technical support, sharing e-books to devices (mobile, tabs), full-text searching, use of Boolean operators, and access control. The study recommended that library professionals of universities should be careful in planning library digitization and they should consider the above features before implementing any digital library software in their libraries.