Gears is an experimental asynchronous programming library for Scala 3 that enables direct-style async programming with structured concurrency. It provides Futures for concurrent computations, Channels for communication between computations, and an Async context for managing execution. The library works across JVM (with virtual threads), Scala Native, and Scala.js (with Wasm support), implementing structured concurrency principles with automatic cancellation propagation. The architecture features a shared core with platform-specific implementations, using delimited continuations or fibers for suspension/resume operations.