Core utilities - zero dependency base library for JDK 25+

Feature toggle/flag support - grayscale release, A/B testing, dynamic configuration for JDK 25+

Functional programming utilities for JDK 25+ - Monads, Pattern Matching, Pipeline, Lens

Graph data structures and algorithms - directed/undirected graphs, BFS/DFS, shortest path, topological sort for JDK 25+

Image processing utilities - resize, crop, rotate, watermark, compress, format conversion for JDK 25+. Includes core image data types (Raster, PixelFormat) merged from opencode-base-image-core in V1.0.4.

IO utilities for file operations, resource loading, and stream processing

OpenCode Base Lock - Unified lock abstraction for local and distributed locks (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+

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

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