Rustical is an open-source CalDAV and CardDAV server written in Rust, providing a lightweight, self-hosted alternative for calendar and addressbook synchronization. It implements the core WebDAV extensions (RFC 4791, 6352) with support for CalDAV scheduling, CardDAV group membership, WebDAV Push (web-push) notifications, and a built-in web frontend for management. The architecture is a modular Rust workspace with separate crates for DAV infrastructure, protocol handlers (caldav, carddav), storage abstraction, SQLite backend, XML serialization, OIDC authentication, and a Lit-based web UI. The server exposes RESTful HTTP endpoints via Axum, uses SQLite for persistence with `sqlx`, and supports app tokens, OIDC, and Nextcloud login for authentication. The codebase demonstrates solid engineering with thorough integration tests, snapshot testing, CI/CD pipelines, and a clear separation of concerns. However, it contains some workarounds and TODOs indicating active development rather than a polished final product. The custom XML derive macros and store trait pattern are particularly well-crafted and potentially reusable.
htsjdk is a comprehensive Java library for reading, writing, and manipulating high-throughput sequencing (HTS) data formats, including SAM, BAM, CRAM, VCF, BCF, FASTQ, FASTA, BED, and GFF3. It provides format-specific codecs, indexing (BAI, CRAI, CSI, Tabix, tribble), block-compressed I/O (BGZF with libdeflate acceleration), and a plugin-based codec registry (beta package). The library is used by major bioinformatics tools like Picard, GATK, and IGV. It includes extensive CRAM compression support (rANS, FQZComp, range coding, name tokenisation) and versioned codec implementations for CRAM 3.0/3.1 and VCF 4.0-4.3. The architecture follows a layered design: low-level I/O streams, format-specific readers/writers, and a higher-level plugin framework for content-type decoupling. While the codebase is actively maintained and well-tested, it contains some deprecated APIs, experimental beta code, and a few unimplemented code paths, reflecting its long evolution and breadth of format support.