The New Relic One blog series highlights popular open-source applications that can be deployed to gain specific insights into application performance. These applications include Event Stream, Neon, Network Telemetry, and SLO/R, each addressing different needs such as real-time data analysis, dashboard creation, network traffic visualization, and service-level objective (SLO) attainment measurement. To deploy these apps, users need access to New Relic One, the New Relic CLI, a personal API key, Node v10 or higher, and a GitHub account. The applications are designed to be customizable and can be forked or deployed from GitHub, with resources available for building custom applications as well as contributing to open-source projects.