Lightweight service virtualization/ API simulation / API mocking tool
Drill is an HTTP load testing application written in Rust
The most advanced tool for HTTP API
The Functional toolkit for Kotlin HTTP applications
mitmproxy implemented with golang
Cross-platform API testing client for humans
WireMock.Net is a product for stubbing and mocking web HTTP responses
Hurl, run and test HTTP requests with plain text
Language-agnostic HTTP API Testing Tool