This book constitutes the refereed proceedings of the 25th International Conference, CRIWG+CollabTech 2019, held in Kyoto, Japan in September 2019. The 12 full papers presented in this book together with 8 work-in-progress papers were carefully reviewed and selected from 28 submissions, and the program also included an invited talk. This year presented a merger of the CRIWG and CollabTech conferences after having been jointly held since 2014. The papers published in this proceedings focus on innovative collaboration technologies and social computing.

This book constitutes the refereed proceedings of the 10th International Conference on Collaboration Technologies, CollabTech 2018, held in Costa de Caparica, in September 2018. The 12 full papers presented in this book together with 4 short papers were carefully reviewed and selected from 36 submissions. The papers focus on topics such as: Communication Enhancement, Inter-Cultural Collaboration, Learning Support System, Entertainment System, Social Studies, and UI and UX.