Institutions, organisations, and policymakers use open educational resources (OERs) to promote student equity and social inclusion. The global COVID-19 crisis highlighted the need for lifelong learning and underscored the importance of the higher education system in this endeavour. This study describes informal learning among adults through OERs, during the COVID-19 crisis, distinguishing between employed and unemployed individuals and between professional and personal development. A questionnaire distributed during the COVID-19 lockdown focused on three themes: (1) types of OERs used for learning during this period; (2) perceived OERs' usefulness; and (3) changes in OER use due to the crisis. Our findings revealed group differences in types of OERs used and in changes brought about by COVID-19, as well as within-group differences based on personal characteristics. Only a few participants reported using massive open online courses (MOOCs). Moreover, videoconferencing usage increased despite low perceived usefulness ratings, pointing to a change in informal learning modes. This exploratory research provides insights into the preferences of individual groups. These insights may be used to reduce socioeconomic disparities, especially among those who have lost their jobs, and to develop effective models for open education.