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1. json-io json-io Public

   Convert Java to JSON/TOON and back. Supports complex object graphs, cyclic references, and TOON format for 40-50% LLM token savings

   Java 377 120

2. java-util java-util Public

   Java utilities: DeepEquals, GraphComparator, Converter, LRUCache, CompactMap/Set, CaseInsensitiveMap, UniqueIdGenerator, FastReader/Writer, and more. Zero dependencies, JDK 8-24.

   Java 437 113