Core utilities - zero dependency base library for JDK 25+

Lightweight logging facade with SPI mechanism for pluggable log engines. 轻量级日志门面，支持 SPI 可插拔日志引擎。

Lunar calendar utilities - solar/lunar conversion, solar terms, festivals, zodiac, GanZhi for JDK 25+

Advanced math and statistics library for JDK 25+ - Statistics, Linear Algebra, Interpolation, Numerical Integration, Combinatorics, Probability Distributions, Special Functions

Money and currency utilities - precise amount calculation, multi-currency support, Chinese uppercase conversion, allocation for JDK 25+

Pure Java neural network forward inference engine - CNN, LSTM, CTC for JDK 25+

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

OpenCode Base Parallel - Modern parallel computing utilities for JDK 25+

OpenCode Base PDF - Zero-dependency PDF processing library for creation, merge, split, form filling and digital signatures (JDK 25+)

OpenCode Base Pool - High-performance object pool for JDK 25+

OpenCode Base Rules - Lightweight business rule engine with DSL, decision tables and hot reload (JDK 25+)