Kong
API gateway built on Nginx + OpenResty — Mashape, 2015 (now Kong Inc.). Supports rate limiting, auth and transformations via Lua plugins.
Open-source version (Apache 2.0) and Enterprise. Config in Postgres or declarative YAML (DB-less mode for immutable config). Kong Mesh (Kuma) as service mesh.
Competitors: APISIX (more open), Tyk, Envoy + Gateway API, AWS API Gateway. Kong wins in hybrid cloud / on-prem where a dedicated gateway is a core architecture component.