Free and open source software development: the end of the teenage years
Journal of Internet Services and Applications volume 8, Article number: 17 (2017)
This thematic series of the Journal of Internet Services and Applications (JISA) presents a collection of articles around the broad topic of the development of Free and Open Source Software (FOSS). This series illustrates the diversity of topics that are related to FOSS -- we received submissions from many different areas; for example, dealing with communication and coordination within FOSS communities, licensing, adoption of Kanban in FOSS settings, and the use of an open model in the editorship of standards. Moreover, the studies presented were conducted using data collected from different sources, including software repositories, mailing lists, interviews, questionnaires and field notes, and were analyzed using quantitative and qualitative methods, including case studies and action research methods.
The FOSS model has become an important driving force in today’s software development environment, resulting in many prominent projects that are used extensively through the entire development stack, from kernels to sophisticated end-user applications. Even startups and commercial projects are increasingly participating in FOSS . The 10th Annual Future of Open Source Survey  showed that 65% of the surveyed companies leverage FOSS to speed up application development, and 55% leverage FOSS for production infrastructure. On the other hand, the movement has introduced new challenges [3,4,5,6,7], especially in relation to openness and the innovative nature of this development model.
The openness and success of the FOSS model is a good topic for research. Researchers from different areas and backgrounds are able to analyze publicly available data to better understand how software is developed [8, 9], learn from it [10, 11], and to propose ways to improve FOSS processes [12,13,14]. The available data range from technical artifacts, to messages exchanged via mailing lists, forums and chats, and discussions on tasks. All these factors attracted and enabled studies related to management [15,16,17], software architecture and evolution [9, 18,19,20], software testing , human and social aspects of software engineering [22,23,24,25], software engineering education [26,27,28,29], etc.
One issue worth highlighting is that FOSS projects are open collaboration communities, in which social aspects are important . Therefore, analyzing the social structure of FOSS projects and behavior within communities has attracted attention from many diverse researcher groups. For example, there is a huge body of knowledge on the motivation of volunteers that joined the workforce of FOSS projects [31,32,33,34,35]. The developer-joining process also drew the attention of researchers from different areas attempting to understand how developers join [36,37,38,39], evolve [40, 41], and become central [42, 43] in a FOSS community.
The FOSS model has spread well beyond software, and inspired different initiatives in different domains [44,45,46,47,48,49,50,51] such as open innovation [44, 51], open hardware [46, 49, 52], open politics [47, 48], open content (e.g., Wikipedia, OpenStreetMap) [50, 53, 54] and open education resources [55, 56].
2 Papers included in this thematic series
The set of papers selected for this thematic series covers different research approaches, providing a broad overview of the area, with its tools, platforms, and research methods. Next, we briefly summarise the main aspects of the individual papers accepted for publication in this special issue.
As mentioned before, FOSS projects are, in general, open collaboration communities, in which social relationships are important. Social relationships become more complicated when it is necessary to orchestrate the efforts to communicate and coordinate effectively throughout an ecosystem of interrelated software products to achieve a specific goal. In the paper "Herding cats in a FOSS ecosystem: a tale of communication and coordination for release management" , Germán Poo-Camaño and his colleagues conducted a case study to better understand how communication and coordination take place in release management of the GNOME ecosystem. They quantitatively and qualitatively analyzed two and a half years of projects’ mailing lists and interviewed developers. Poo-Caamaño and colleagues found that, for GNOME, mailing lists are still the main communication channel used for the release management team, which also make strong use of an IRC channel to conduct synchronous meeting and to discuss with developers. They use the mailing list to discuss different things, including requests for comments/approval, release announcement and to send schedule reminders. In addition, the authors identified the main responsibilities and activities conducted by the GNOME release team, and the challenges to manage releases in FOSS ecosystems. They end up bringing seven valuable lessons learned from their results.
Social relationships are also explored in the paper "Core-periphery communication and the success of free/libre open source software projects."  In this paper, Crowston and Shamshurin bring an study on how community interactions relates to project health and success in Apache projects. The authors are explicitly interested in how volume and content of messages sent via mailing list by core and periphery member can be related to success of projects. Their results indicate that successful projects have a larger volume of communication - suggesting an active community. They also found that, although both core and periphery members place a high volume of messages, core members communicate more than those from the periphery. Regarding the content of the messages, they found no association between project success and the group feeling of ownership of the project.
Other than (and adding to) the community and their social relationship, another central element of FOSS is licensing. Licenses grant specific permissions that regulate how source code can be further used. FOSS licenses make it easy for others to contribute to a project without having to seek special permission. In the paper "Changes in free and open source software licenses: managerial interventions and variations on project attractiveness,"  Carlos Denner Jr. analyzes the relationship between changes in licensing terms and projects’ attractiveness. By analyzing 756 FOSS projects that changed their license, Denner observed 35 different variation patterns. His results indicate that the legal terms in the license are associated with project attractiveness, however variations in attractiveness after a license intervention are not symmetrical.
In the paper "Can FOSS projects benefit from integrating Kanban" , Annemarie Harzl explores how the use of Kanban is perceived by a FOSS community mainly kept by students. By means of three action-research cycles, the author found that Kanban in these specific settings are beneficial, both for managing the tasks and as a learning opportunity for the students. The paper shows an interesting perspective on how a FOSS project can be maintained in hybrid settings, considering students and applying the coach agile role to manage the project. It also shows, ultimately, that adopting FOSS as a learning environment, by putting students to work on real projects, can benefit both project and students’ learning process.
A technical aspect of FOSS development is addressed by the paper "Concurrency bugs in open source software: a case study"  by Sara Abbaspour Asadollah and her colleagues. In this paper, the authors are interested in better understanding the differences between concurrency-related bugs and other bugs by analyzing bug reports from five Apache projects. They found that the main type of concurrency bugs are related to data race condition, but suspension, deadlock and order violation also appear with some frequency. An interesting finding is that concurrency bugs are more complex than other bugs. The paper reports that, in general, concurrency bugs require longer fixing times and that around 50% of the unreproducible bugs are concurrency bugs. The authors claim that the results help software developers to understand concurrency bugs, estimate the most time-consuming ones, and prioritizing them to speed up the debugging and bug-fixing processes.
Showing how the open model is spread, the paper from Jonas Gamalielsson and Björn Lundell, "On organisational involvement and collaboration in W3C standards through editorship" , brings a characterization on how organizations contribute to W3C open standards related to software development. The authors analyzed all the contributions to W3C standards and found that one standardisation organisation and larger enterprises (mainly from US) are dominating involvement in the open standards editorship. However, they also observed a large number of small and medium enterprises, from a wide range of countries, involved in a relatively large number of standards, highlighting the openness of the process. In addition, by analyzing the social network of organizations and countries, it was possible to notice that there is a high level of collaboration between organizations and countries, with larger organizations and US playing a central role. The paper shows the openness of the standards editorship, bringing insights and implications for W3C and for the organizations that want to take place on this endeavour, or engage a collaboration.
3 Paper selection
There were two independent cycles of submissions and the papers were published after acceptance and the final version received from the authors. We submitted an open call for submissions, and invited the three best papers from the Open Source Systems conference (OSS 2016) in Gothenburg, Sweden --one of the special issue editors was one of the OSS 2016 program co-chairs-- to submit extended versions of their papers to this series. Each submitted manuscript went through several revisions before the final acceptance. We invited a number of leading experts in the area to form an initial editorial committee, and additional reviewers had been invited on demand in order to provide valuable feedback for the authors and review different aspects of the papers. All manuscripts were reviewed by at least three reviewers. We received a total of 10 submissions, from which we accepted six for publication. All accepted papers are extensions of previously published papers. Five of them extending previous work from the Open Source Systems Conference. The papers were reviewed by a total of 31 reviewers. The names of the editorial committee and reviewers are listed on the acknowledgements of this editorial.
4 Concluding remarks
This is clearly not the last word on free and open source software, but as Eric Raymond has aptly characterised it – last words are about dead things and open source software is quite lustily alive. Although the history of free and open source software is as old as software itself, there is no doubt that considerable impetus was afforded to the topic when the term open source was coined in 1998. Given that almost 20 years have elapsed since then, it is interesting to reflect on how much the field has evolved in that period. This is very much in evidence in the range of topics and issues covered in the papers submitted to this thematic series.
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We thank all the authors, reviewers, editors-in-chief, and staff for the great work, which supported this thematic series on this important topic. In particular, we thank all the reviewers:
Andrea Capiluppi (Brunel University, UK), Ann Barcomb (University of Limerick, Ireland), Anna Filippova (CMU, USA), Aron Lindberg (Stevens Institute of Technology, USA), Christoph Treude (University of Adelaide, Australia), Daniel Germán (UVic, Canada), Erik Trainer (CMU, USA), Fernando Figueira (UFRN, Brazil), Filipe Saraiva (UFPI, Brazil), Gustavo Ansaldi Oliva (Queen’s University, Canada), Gustavo Pinto (UFPA, Brazil), Habtom Gidey (University of Limerick, Ireland), Harry Halpin (W3C, UK), Igor Scaliante Wiese (UTFPR, Brazil), Shobha Chengalur-Smith (University at Albany, USA), Irum Inayat (National University of Computer and Emerging Sciences, Pakistan), Jason Tsay (CMU, USA), Johan Linåker (Lund University, Sweden), Jose Teixeira (University of Turku, Finland), Josiane Kroll (PUCRS, Brazil), Kelly Blincoe (University of Auckland, New Zealand), Kevin Crowston (Syracuse University, USA), Marcelo Zanetti (UFSM, Brazil), Marco Aurélio Graciotto Silva (UTFPR, Brazil), Marco Ortu (University of Cagliari, Italy), Mauricio Aniche (TU Delft, Nederlands), Paulo Barbosa (UEPB, Brazil), Shane McIntosh (McGill University, Canada), Sven Apel (University of Passau, Germany), Tiago Silva da Silva (UNIFESP, Brazil), Zhendong Wu (National University of Defense Technology, China). The voluntary work of these researchers was crucial for this thematic series. This work was supported by the Science Foundation Ireland grant 13/RC/2094.
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Steinmacher, I., Robles, G., Fitzgerald, B. et al. Free and open source software development: the end of the teenage years. J Internet Serv Appl 8, 17 (2017). https://doi.org/10.1186/s13174-017-0069-9