The set of papers collected in this issue originated from the AGERE! Workshop series - the last edition was held in 2017 - and concern the application of actor-based approaches to mainstream application domains and the discussion of related issues. The first part concerns Web Programming;

Web Programming - Parallel and Distributed Web Programming with Actors.- Data-intensive Parallel Programming - OpenCL Actors - Adding Data Parallelism to Actor-based Programming with CAF.- Mobile Computing - AmbientJS: A Mobile Cross-platform Actor Library for Multi-networked Mobile Applications.- Self-Organizing Systems - Programming Actor-based Collective Adaptive Systems.- Scheduling - Pluggable Scheduling for the Reactor Programming Model.- Debugging - A Study of Concurrency Bugs and Advanced Development Support for Actor-based Programs.- Communication and Coordination - A Model for Separating Communication Concerns of Concurrent Systems.- Monitoring - A Homogeneous Actor-Based Monitor Language for Adaptive Behavior. 

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