Abstract Grassroots initiatives promoting sharing-for-community are viewed as contributing to the transition towards a more socially equitable and environmentally sustainable world. However, along with other challenges, they often encounter technological barriers. In this article we report on our engagement with a number of self-organised foodsaving and sharing communities active in Europe which use the open-source platform Karrot to coordinate their activities. Our aim has been to explore the use of Karrot, across various contexts. We have also been interested in understanding Karrot’s impact on community-led foodsaving and sharing daily practices, as well as on community governance and organising; aspects which distinguish grassroots initiatives from more top-down anti-food waste models. We found that while Karrot facilitates certain processes, it does not fully meet the needs of the researched communities, which in turn have been configuring Karrot and have been developing unique digital ecologies, combining Karrot with off-the-shelf commercial tools. By recognising foodsaving and sharing communities as elements of a larger transformational ecosystem, we broaden our discussion to include the role of technology beyond just community-led foodsaving and sharing initiatives. Reflecting on the process of developing digital ecologies, we explore interoperability as a design element that can enhance sharing-for-community practices. Next, we propose strategies to strengthen community governance and organisation. Finally, we seed Community-Supported Software as an evolving framework that can facilitate the collaboration between grassroots place-based and software communities.

Technology plays a pivotal role in driving transformation through grassroots movements, which operate on a local scale while embracing a global perspective on sustainability. Consequently, research emerged within Sustainable HCI, aiming to derive design principles that can empower these movements to scale their impact. However, a notable gap exists in contributions when addressing scalability of large free and open-source software (FOSS) projects.

This paper explores the value of a participant-led walking method, during which matters of place in urban or rural contexts are explored. While walking, a diverse dataset is collected, including audio recordings, photographs, GPS tracks, as well as three words that participants are prompted for at each stop along the walk via a bespoke web application. We used this approach in an urban community in the UK and a rural community in Greece as part of ongoing place-based initiatives. Our findings show how participants connected personal and emotional stories with structural issues, countered official, ‘authorised’ discourses about both places, and how maps and videos created after the walks acted as boundary objects. We reflect on the claims of walking as a method that fosters equitable researcher-participant relationships, outline future design directions for participatory walking and mapping technologies, and consider the value of walking methods and map-making for participatory design.

Despite sharing economy's promise of a novel, inclusive and community building socio-techno-economic system, sharing economy has been indicted, among others for profiteering from previously private and occasionally non-monetized activities, for turning the activity of sharing into an individualistic and impersonal one, for reproducing stereotypes and creating precarious jobs. In the epicenter of such critiques are the 'big' and 'limelight-ed' platform-firms, such as AirBnB and Uber and the digital infrastructures they employ. To the best of our knowledge, the majority of related research focuses on sharing economy platforms of this ilk. In response, acknowledging that the problem is not the agency of the digital in the activity of sharing per se, but that the wrong people set the terms, design and benefit from this mediation, we find it timely to explore the existence of community-driven sharing economy initiatives and explore how they use the digital to support their ends. As a result, in this paper we report from our engagement with a ride-sharing initiative, called 'Share the ride ;)' that has operated within a Facebook group since 2009 and is the most popular ride-sharing 'platform' in Greece. Extrapolating from our findings and while adopting a 'Solidarity HCI' approach, a call to design for 'human' rather than market needs, we participate in the 'sharing discourse' by providing design implications for the development of sharing economy platforms which can favor community building, participation, self-organization and the nurturing of a generative sharing ideology. To this end, we suggest the development of malleable sharing economy platforms and of mechanisms that can support the development of relational trust(s) and enduring social connections. Finally, we underscore that in order to favor the establishment of such relations, those platforms should employ architectures which esteem pluralism and self-affirmation.