Langroid is an intuitive, lightweight, extensible, and principled Python framework for easily building LLM-powered applications, developed by CMU and UW-Madison researchers. It allows users to set up Agents, equip them with optional components such as LLMs, vector-stores, and tools/functions, assign them tasks, and have them collaboratively solve problems by exchanging messages. This Multi-Agent paradigm simplifies the developer experience by offering a fresh approach to LLM app-development, designed to work seamlessly with practically any LLM without relying on other major LLM frameworks.