The Three-volume Set Lnicst 561, 562 563 Constitutes The Refereed Post-conferenceproceedings Of The 19th Eai International Conferenceoncollaborative Computing: Networking, Applications And Worksharing, Collaboratecom 2023, Held In Corfu Island, Greece, Duringoctober 4-6, 2023.the72full Papers Presented In These Proceedings Were Carefully Reviewed Andselected From176submissions. The Papers Are Organized In The Following Topicalsections:volume I:collaborative Computing,edge Computing & Collaborative Working,blockchain Applications,code Search And Completion,edge Computing Scheduling And Offloading.volume Ii:deep Learning And Application,graph Computing,security And Privacy Protection Andprocessing And Recognition.volume Iii:onsite Session Day 2,federated Learning And Application,collaborative Working,edge Computingandprediction, Optimization And Applications.