Cross-platform asynchronous I/O libuv.org/

https://github.com/cisco/mlspp

Performance-portable, length-agnostic SIMD with runtime dispatch

WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks simdjson.org