Proliferate lets teams manage a fleet of AI agents from the desktop, running them locally or in the cloud. The platform is 100% open source and free to use, and helps teams build company-specific background agents with secure access to internal services, sandbox environments, and live multiplayer previews for verification. It was founded by Pablo Hansen, who completed a master's degree in AI at 19 and was the first hire at Onyx (YC W24). Proliferate was part of Y Combinator's Summer 2025 batch.