- HAProxy : C : load balancer
- Free, fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications
- memcached : C : memory cache
- Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load
- Varnish : C : caching proxy
- Web application accelerator also known as a caching HTTP reverse proxy
- bombardier : Go
- Fast cross-platform HTTP benchmarking tool
- WebPagetest : PHP/Python
- Free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds
- wrk : C
- Modern HTTP benchmarking tool capable of generating significant load when run on a single multi-core CPU
- drill : Rust
- HTTP load testing application written in Rust inspired by Ansible syntax
- Vegeta : Go
- Versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate
- Cross-Origin Resource Sharing (CORS) - Mechanism to enable client-side cross-origin requests
- Zstandard (zstd) - Real-time compression algorithm, providing high compression ratios