Building peer-to-peer decentralised applications remains difficult and error-prone. Most attempts at this either abandon collaborative features entirely or fall back on centralised architectures. The Spritely Institute is working on this challenge by creating (among other things) Goblins, a Guile framework that makes secure, fault-tolerant peer-to-peer applications accessible to developers. These tools are especially valuable for developers building secure collaborative applications that aim to foster healthy online communities. This talk walks you through Goblins’ most powerful features, including the actor model, object capability security, networking, time travel debugging, and persistence.