Core utilities - zero dependency base library for JDK 25+

OpenCode Base I18n - Internationalization message solution for JDK 25+

OAuth 2.0 / OIDC client library - Authorization Code, Client Credentials, Device Code, PKCE support for JDK 25+

OpenCode Base Observability - Tracing, span, and slow-log utilities for JDK 25+

OpenCode Base - Reflection utilities for JDK 25+

Unified serialization facade with SPI mechanism, supporting JSON, JDK binary, and more. 统一序列化门面，支持 SPI 可插拔机制，支持 JSON、JDK 二进制等多种格式。

Comprehensive string processing library with naming conversion, template engine, similarity algorithms, and data desensitization for JDK 25+

OpenCode Base YAML processing component with SPI support

OpenCode Base Captcha - Zero-dependency CAPTCHA generation library with multiple types support

ClassLoader component for class loading, scanning, resource management and metadata reading for JDK 25+

Collections component providing modern collection utilities, specialized collections (BiMap, Multiset, Multimap, Table), immutable collections, and primitive collections for JDK 25+