Ocelot is a .NET API gateway. After three years of development, Ocelot has built a relatively complete feature set and an active community. Although there is no dearth of excellent API gateways (e.g., Kong), the .NET community appears to prefer Ocelot when building microservices. Part of the reason is that Ocelot integrates well with the .NET ecosystem (e.g., with IdentityServer). Another reason may be that the .NET community has extended Ocelot to support communication protocols such as gRPC, Orleans and WebSocket.