std::bench — Benchmark harness for measuring function performance.std::builtins — Built-in functions available in every Hew program.std::crypto — Cryptographic hashing and utilities.std::fs — File system operations.std::net — TCP networking.std::option — Option helper functions — pure Hew alternatives to the Rust FFI runtime.std::os — Operating system interfaces.std::path — File path and glob utilities.std::process — Process execution.std::result — Result helper functions — pure Hew alternatives to the Rust FFI runtime.std::semaphore — Counting semaphore for concurrency control.std::stream — Stream<T> and Sink<T> — bounded, FIFO data channels.std::string — String conversion and manipulation utilities.std::vec — Vec utility functions.std::crypto::encrypt — Symmetric encryption and decryption.std::crypto::jwt — JSON Web Token encoding and validation.std::crypto::password — Password hashing and verification (Argon2id).std::encoding::base64 — Base64 encoding and decoding — pure Hew implementation.std::encoding::compress — Compression and decompression (gzip, deflate, zlib).std::encoding::csv — CSV parsing — pure Hew implementation.std::encoding::hex — Hexadecimal encoding and decoding.std::encoding::json — JSON parsing and manipulation.std::encoding::markdown — Markdown to HTML conversion.std::encoding::msgpack — MessagePack serialization.std::encoding::protobuf — Protocol Buffers message construction.std::encoding::toml — TOML parsing.std::encoding::wire — Wire format encoding and decoding.std::encoding::yaml — YAML parsing.std::misc::log — Structured logging for Hew programs.std::misc::uuid — UUID generation and validation.std::net::http — HTTP server for handling web requests.std::net::http::http_client — HTTP client for making outbound requests.std::net::ipnet — IP address and CIDR utilities.std::net::mime — MIME type detection.std::net::smtp — SMTP client for sending email.std::net::url — URL parsing.std::net::websocket — WebSocket client for bidirectional communication.std::text::regex — Regular expression matching.std::text::semver — Semantic versioning — pure Hew implementation.std::time::cron — Cron expression parsing and scheduling.std::time::datetime — Date and time operations.