JA4+ is a multi-protocol passive network fingerprinting suite that generates deterministic fingerprints for TLS, HTTP, SSH, TCP, DHCP, X.509, and latency characteristics. The repository provides four independent implementations: a Python reference library, a Rust CLI tool and library, a Wireshark post-dissector plugin, and a Zeek plugin (C++ BiF + Zeek scripts). All implementations share the same fingerprinting algorithm, test pcap files, and expected output snapshots, enabling cross-validation. The system processes raw packet captures (PCAP/PCAPNG) via tshark or direct packet parsing, extracts protocol handshake parameters (cipher suites, extensions, HTTP headers, SSH key exchange algorithms, TCP flags, DHCP options), normalizes them (GREASE removal, sorting, hashing), and outputs structured JA4+ fingerprints. External dependencies include tshark (for PCAP parsing in Python and Rust), Wireshark/Zeek APIs for plugins, and the ja4db.com database for fingerprint-to-software mapping. The architecture is a collection of standalone tools rather than a unified service, with each implementation optimized for its target environment (CLI, packet analyzer, network monitor). While primarily an application toolkit, the repository also includes research-oriented assets such as a fingerprint-to-software mapping CSV, technical documentation with diagrams, and a large corpus of real-world test traffic, making it a hybrid of production tooling and security research.