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• New technologies supporting data collection, data processing and visualisation, and the communication of ideas and results create a wide range of opportunities for participation in citizen science.• Technologies are especially beneficial for opening additional channels for public involvement in research, allowing participants to contribute through a range of activities and engaging newer audiences.• There is a range of existing resources to help project co-ordinators develop and maintain citizen science technologies.• It is important to consider issues such as participant demographics, affordability and access, and fitness for purpose when selecting technologies.