| fmt | Core | Formatted output |
| math | Core | Math functions |
| str | Core | String operations |
| vec | Core | Slice ([]t) operations |
| arr | Core | Array ([n]t) operations |
| number | Core | Numeric utility functions |
| byte | Core | Byte operations |
| char | Core | Character operations (methods) |
| os | Core | Operating system interface |
| env | Core | Environment variables wrapper |
| fs | Core | File system utilities |
| io | Core | Input/output abstraction |
| args | Core | Command-line arguments |
| path | Core | Path handling (struct) |
| bufio | Core | Buffered reading |
| time | Core | Time operations |
| log | Core | Leveled logging |
| json | Core | JSON parsing/generation |
| toml | Core | TOML 1.0 parsing/generation |
| yaml | Core | YAML 1.2 parsing/generation |
| types | Core | Type definitions document |
| sort | Core | Sort constants |
| set | Core | Set |
| deque | Core | Double-ended queue (struct) |
| heap | Core | Min heap (struct) |
| stack | Core | Stack (struct) |
| regexp | Core | Regular expressions |
| process | Core | Process operations |
| async | Core | Async coroutines/cancellation |
| global | Core | Global built-in functions |
| magic | Core | File type detection |
| uuid | Core | UUID v4 |
| bigint | Core | Arbitrary precision integer |
| bool | Core | Boolean type |
| err | Core | Error handling |
| enter | Core | Startup hook |
| leave | Core | Exit hook |
| net | Core | TCP network operations |
| net/http | Submodule | HTTP/1.1 client |
| net/http2 | Submodule | HTTP/2.0 client |
| net/http3 | Submodule | HTTP/3.0 client |
| net/ws | Submodule | WebSocket |
| net/quic | Submodule | QUIC protocol |
| net/tls | Submodule | TLS 1.2/1.3 |
| net/sse | Submodule | SSE client |
| net/client | Submodule | High-level TCP client |
| net/server | Submodule | HTTP server |
| net/dns | Submodule | DNS resolution |
| net/url | Submodule | URL parsing |
| net/cookie | Submodule | HTTP Cookie |
| net/multipart | Submodule | Multipart form |
| net/hpack | Submodule | HPACK header compression |
| net/proxy | Submodule | Proxy support |
| net/pool | Submodule | Connection pool |
| net/unix | Submodule | Unix domain sockets |
| net/ip | Submodule | IP address operations |
| encoding/base64 | Submodule | Base64 encoding/decoding |
| encoding/csv | Submodule | CSV parsing |
| encoding/pem | Submodule | PEM encoding/decoding (RFC 7468) |
| archive/tar | Submodule | TAR archive |
| archive/zip | Submodule | ZIP archive |
| archive/gzip | Submodule | GZIP compression |
| archive/bzip2 | Submodule | BZIP2 decompression |
| archive/xz | Submodule | XZ/LZMA decompression |
| archive/zlib | Submodule | zlib compression (RFC 1950) |
| archive/zstd | Submodule | Zstandard decompression |
| map/linked-hash-map | Submodule | Ordered hash map |
| map/hash-set | Submodule | i64 hash set |
| map/str-map | Submodule | str→str hash map |
| map/str-set | Submodule | str hash set |
| map/tree-map | Submodule | AVL ordered map |
| map/tree-set | Submodule | AVL ordered set |
| collection/queue | Submodule | Generic queue |
| collection/arr-stack | Submodule | Generic stack |
| collection/link | Submodule | Generic doubly linked list |
| collection/map | Submodule | Generic dynamic hash map |
| collection/static-hashmap | Submodule | Generic fixed-capacity hash map |
| database/sql | Submodule | Database access interface |
| crypto/aes | Submodule | AES block core (128/256) |
| crypto/aes-cbc | Submodule | AES-CBC mode (128/256) |
| crypto/aes-ctr | Submodule | AES-CTR mode (128/256) |
| crypto/aes-gcm | Submodule | AES-GCM AEAD (128/256) |
| crypto/des | Submodule | DES encryption/decryption |
| crypto/tdes | Submodule | Triple DES |
| crypto/rsa | Submodule | RSA modular exponentiation |
| crypto/md5 | Submodule | MD5 hash |
| crypto/sha1 | Submodule | SHA-1 hash |
| crypto/sha224 | Submodule | SHA-224 hash |
| crypto/sha256 | Submodule | SHA-256 hash |
| crypto/sha384 | Submodule | SHA-384 hash |
| crypto/sha512 | Submodule | SHA-512 hash |
| crypto/sha3 | Submodule | SHA-3 hash |
| crypto/blake2 | Submodule | BLAKE2 hash |
| crypto/crc-16 | Submodule | CRC16 checksum |
| crypto/crc-32 | Submodule | CRC32 checksum |
| crypto/crc-64 | Submodule | CRC64 checksum |
| crypto/fnv | Submodule | FNV-1 hash |
| crypto/fnv-1a-32 | Submodule | FNV-1a hash |
| crypto/hmac | Submodule | HMAC authentication code |
| crypto/hkdf | Submodule | HKDF key derivation |
| crypto/pbkdf2 | Submodule | PBKDF2 key derivation |
| crypto/argon2 | Submodule | Argon2 key derivation |
| crypto/scrypt | Submodule | scrypt key derivation |
| crypto/chacha20-poly1305 | Submodule | ChaCha20-Poly1305 |
| crypto/rc4 | Submodule | RC4 stream cipher |
| crypto/ecdsa | Submodule | ECDSA signature |
| crypto/ed25519 | Submodule | Ed25519 signature |
| crypto/x25519 | Submodule | X25519 key exchange |
| crypto/base32 | Submodule | Base32 encoding/decoding |
| crypto/rand | Submodule | Random number generator |
| crypto/x509 | Submodule | X.509 DER parsing |