A lightweight, reusable thread pool that submits tasks (Callable) and waits for all to complete, propagating the first exception via an AtomicReference. It does not depend on any internal project code beyond a simple interface, making it trivially extractable to any Java project that needs parallel work with fail-fast semantics.

An endian-aware DataInputStream wrapper that reads little-endian integers, shorts, longs, floats, and arrays with optional bounds checking. It provides robust skip logic and can read null-terminated ASCII or UTF-16 strings. This is a general-purpose utility for any project that needs to parse binary file formats with custom endianness.

An interface and abstract implementation for uniform access to hierarchical directories, supporting file/directory entry listing, reading, and recursive copying. Concrete implementations cover the local filesystem (FileDirectory) and ZIP archives (ZipRODirectory). The abstraction is clean, self-contained (only depends on Java standard library), and can be reused in any project that needs to treat directories and ZIP files interchangeably.

A comprehensive parser and serializer for Android resource configuration qualifiers (language, region, screen density, orientation, BCP47 variants, etc.). It handles all known qualifier types, generates the canonical qualifier string, and supports comparison. While domain-specific to Android, it is the most complete open-source implementation of Android resource config parsing and could be reused in any Android tooling project.