Open source software (free software) has emerged as a major field of scientific inquiry across a number of disciplines. When the concept of open source began to gain mindshare in the global business community, decision makers faced a challenge: to convert hype and potential into sustainable profit and viable business models.

Full Papers.- FOCSE: An OWA-based Evaluation Framework for OS Adoption in Critical Environments.- Open Source Collaboration for Fostering Off-The-Shelf Components Selection.- From the Cathedral to the Bazaar: An Empirical Study of the Lifecycle of Volunteer Community Projects.- Project Entity Matching across FLOSS Repositories.- Can Knowledge Management be Open Source?.- Emergent Decision-Making Practices in Free/Libre Open Source Software (Floss) Development Teams.- Experiences on Product Development with Open Source Software.- Exploring the Effects of Coordination and Communication Tools on the Efficiency of Open Source Projects using Data Envelopment Analysis.- Innovation in Open Source Software Development: A Tale of Two Features.- Corporate Involvement of Libre Software: Study of Presence in Debian Code over Time.- Sprint-driven development: working, learning and the process of enculturation in the PyPy community.- Using Repository of Repositories (RoRs) to Study the Growth of F/OSS Projects: A Meta-Analysis Research Approach.- Community Structure, Individual Participation and the Social Construction of Merit.- OpenBQR: a framework for the assessment of OSS.- Network Analysis of the SourceForge.net Community.- Short Papers.- Influence in the Linux Kernel Community.- EDOS Distribution System: a P2P architecture for open-source content dissemination.- Reusing an open source application — practical experiences with a mobile CRM pilot.- The role of trust in OSS communities — Case Linux Kernel community.- Authenticating from multiple authentication sources in a collaborative platform.- Learning and the imperative of production in Free/Open Source development.- Open source technologies for visually impaired people.- Different Bug Fixing Regimes? A Preliminary Casefor Superbugs.- Free/Open Services: Conceptualization, Classification, and Commercialization.- Surveying Industrial Roles in Open Source Software Development.- Guiding the Discovery of Open Source Software Processes with a Reference Model.- Effect of Coupling on Defect Proneness in Evolutionary Open-Source Software Development.- The Use of Open Source Software in Enterprise Distributed Computing Environments.- Shared Assumption Concerning Technical Determination in Apache Web Server Developer Community.- Learning Through Practical Involvement in the OSS Ecosystem: Experiences from a Masters Assignment.- Release Management in Free Software Projects: Practices and Problems.- Context-Dependent Evaluation Methodology for Open Source Software.- Benefits and Drawbacks of Open Source Software: An Exploratory Study of Secondary Software Firms.- Introducing Usability Practices to OSS: The Insiders’ Experience.- Perceptions on F/OSS Adoption.- Open Source Software and Open Data Standards as a form of Technology Adoption: a Case Study.- Free/Open Source Software Adoption, Public Policies and Development Indicators: An International Comparison.- Levels of Formality in FOSS Communities.- Stakeholder value, usage, needs and obligations from differnet types of F/LOSS licenses.- Panels.- to Panel Discussions at the Third International Conference on Open Source Systems — OSS 2007.- Legal issues for free and open source software in government.- Data and analyses sharing to support research on free/libre open source software.- Tutorials.- to OSS 2007 Tutorial Program.- How to Gather FLOSS Metrics.- EDOS-Tools Tutorial: EDOS Tools for Linux Distributions Dependencies Management and Quality Assurance.- Quality Specification, Testing and Certification of Bespoken, Open Source andCommercial Off-The-Shelf Systems.- Workshops.- to Workshops at the Third International Conference on Open Source Systems — OSS 2007.- 1st International Workshop on Trust in Open Source Software (TOSS).- Open Source Software and Product Lines 2007.- Toward a New Industrial Organization? OSS in Economic and Managerial Perspective.- 2nd International Workshop on Public Data about Software Development (WoPDaSD 2007).- FOSLET 07 — Workshop on Free and Open Source Learning Environments and Tools.